/*
Copyright (c) 2000 ThinkQuest Team C004606. All rights reserved.

Based on:
	Menu 0.8 990602
	by gary smith, July 1997
	Copyright (c) 1997-1999 Netscape Communications Corp.
*/

var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 &&
  parseFloat(navigator.appVersion) >= 4) ? 1 : 0;
var isMinIE4 = (document.all) ? 1 : 0;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.") >= 0) ? 1 : 0;

function Menu(label)
{
  this.type = "Menu";
  this.fontSize = 12;
  this.fontWeight = "plain";
  this.fontFamily = "arial,helvetica,espy,sans-serif";
  this.fontColor = "#3333ff";
  this.fontColorHilite = "#ffffff";
  this.bgColor = "#555555";
  this.menuBorder = 1;
  this.menuItemBorder = 0;//1;
  this.menuItemBgColor = "#ffcc33";
  this.menuLiteBgColor = "#ffffff";
  this.menuBorderBgColor = "#777777";
  this.menuHiliteBgColor = "#0000cc";
  this.menuContainerBgColor = "#cccccc";
  this.childMenuIcon = "/C004606/media/arrows.gif";
  this.childMenuIconHilite = "/C004606/media/arrows2.gif";
  this.items = new Array();
  this.actions = new Array();
  this.colors = new Array();
  this.mouseovers = new Array();
  this.mouseouts = new Array();
  this.childMenus = new Array();

  this.addMenuItem = addMenuItem;
  this.addMenuSeparator = addMenuSeparator;
  this.writeMenus = writeMenus;
  this.showMenu = showMenu;
  this.showMenuEx = showMenuEx;
  this.onMenuItemOver = onMenuItemOver;
  this.onMenuItemOut = onMenuItemOut;
  this.onMenuItemDown = onMenuItemDown;
  this.onMenuItemAction = onMenuItemAction;
  this.hideMenu = hideMenu;
  this.hideChildMenu = hideChildMenu;
  this.mouseTracker = mouseTracker;
  this.setMouseTracker = setMouseTracker;

  if (!window.menus) window.menus = new Array();
  this.label = label || "menuLabel" + window.menus.length;
  window.menus[this.label] = this;
  window.menus[window.menus.length] = this;
  if (!window.activeMenus) window.activeMenus = new Array();
  if (!window.menuContainers) window.menuContainers = new Array();
  if (!window.mDrag)
  {
    window.mDrag  = new Object();
    mDrag.startMenuDrag = startMenuDrag;
    mDrag.doMenuDrag  = doMenuDrag;
    this.setMouseTracker();
  }
  if (window.MenuAPI) MenuAPI(this);
  this.disableHide = false;
}

function addMenuItem(label, action, mouseover, mouseout, color) {
  this.items[this.items.length] = label;
  this.actions[this.actions.length] = action;
  this.mouseovers[this.mouseovers.length] = mouseover;
  this.mouseouts[this.mouseouts.length] = mouseout;
  this.colors[this.colors.length] = color;
}

function addMenuSeparator()
{
  this.items[this.items.length] = "separator";
  this.actions[this.actions.length] = "";
  this.menuItemBorder = 0;
}

function writeMenus(container)
{
  window.defaultStatus = "please wait while the menu loads";

  if (!container && document.layers) {
    if (eval("document.width")) 
      container = new Layer(1000);
  } else if (!container && document.all) {
    if (!document.all["menuContainer"]) 
      document.writeln('<SPAN ID="menuContainer"></SPAN>');
    container = document.all["menuContainer"];
  }
  if (!container && !window.delayWriteMenus) {
    window.delayWriteMenus = this.writeMenus;
    window.menuContainerBgColor = this.menuContainerBgColor;
    setTimeout('delayWriteMenus()', 3000);
    return;
  }
  container.isContainer = "menuContainer" + menuContainers.length;
  menuContainers[menuContainers.length] = container;
  container.menus = new Array();
  for (var i=0; i<window.menus.length; i++) 
    container.menus[i] = window.menus[i];
  window.menus.length = 0;
  var countMenus = 0;
  var countItems = 0;
  var top = 0;
  var content = '';
  var proto;
  for (var i=0; i<container.menus.length; i++, countMenus++) {
    var menu = container.menus[i];
    proto = menu.prototypeStyles || this.prototypeStyles || menu;
    content += ''+
    '<DIV ID="menuLayer'+ countMenus +'" STYLE="position:absolute;left:10;top:'+ (i * 100) +';visibility:hidden;">\n'+
    '  <DIV ID="menuLite'+ countMenus +'" STYLE="position:absolute;left:'+ proto.menuBorder +';top:'+ proto.menuBorder +';visibility:hide;" onMouseOut="hideMenu(this);">\n'+
    '  <DIV ID="menuFg'+ countMenus +'" STYLE="position:absolute;left:1;top:1;visibility:hide;">\n'+
    '';
    var x=i;
    for (var i=0; i<menu.items.length; i++) {
      var item = menu.items[i];
      var childMenu = false;
      var defaultHeight = 20;
      var defaultIndent = 15;
      if (item.label) {
        item = item.label;
        childMenu = true;
      } else if (item.indexOf(".gif") != -1 && item.indexOf("<IMG") == -1) {
        item = '<IMG SRC="' + item + '" NAME="menuItem'+ countItems +'Img">';
        defaultIndent = 0;
        if (document.layers) {
          defaultHeight = null;
        }
      }
      proto.menuItemHeight = proto.menuItemHeight || defaultHeight;
      proto.menuItemIndent = proto.menuItemIndent || defaultIndent;
      var itemProps = 'visibility:hide;font-Family:' + proto.fontFamily +';font-Weight:' + proto.fontWeight + ';fontSize:' + proto.fontSize + ';';
      if (document.all) 
        itemProps += 'font-size:' + proto.fontSize + ';" onMouseOver="onMenuItemOver(null,this);" onMouseOut="onMenuItemOut(null,this);" onClick="onMenuItemAction(null,this);';
      var dTag  = '<DIV ID="menuItem'+ countItems +'" STYLE="position:absolute;left:0;top:'+ (i * proto.menuItemHeight) +';'+ itemProps +'">';
      var dText   = '<DIV ID="menuItemText'+ countItems +'" STYLE="position:absolute;left:' + proto.menuItemIndent + ';top:0;color:'+ proto.fontColor +';">'+ item +'</DIV>\n<DIV ID="menuItemHilite'+ countItems +'" STYLE="position:absolute;left:' + proto.menuItemIndent + ';top:0;color:'+ proto.fontColorHilite +';visibility:hidden;">'+ item +'</DIV>';
      if (item == "separator") {
        content += ( dTag + '<DIV ID="menuSeparator'+ countItems +'" STYLE="position:absolute;left:1;top:2;"></DIV>\n<DIV ID="menuSeparatorLite'+ countItems +'" STYLE="position:absolute;left:1;top:2;"></DIV>\n</DIV>');
      } else if (childMenu) {
        content += ( dTag + dText + '<DIV ID="childMenu'+ countItems +'" STYLE="position:absolute;left:0;top:3;'+ itemProps +'"><IMG SRC="'+ proto.childMenuIcon +'"></DIV>\n</DIV>');
      } else {
        content += ( dTag + dText + '</DIV>');
      }
      countItems++;
    }
    content += '    <DIV ID="focusItem'+ countMenus +'" STYLE="position:absolute;left:0;top:0;visibility:hide;" onClick="onMenuItemAction(null,this);">&nbsp;</DIV>\n';
    content += '   </DIV>\n  </DIV>\n</DIV>\n';
    i=x;
  }
  if (!container) return;
  if (container.innerHTML) {
    container.innerHTML=content;
  } else {
    container.document.open("text/html");
    container.document.writeln(content);
    container.document.close();
  }
  proto = null;
  if (container.document.layers) {
    container.clip.width = window.innerWidth;
    container.clip.height = window.innerHeight;
    container.onmouseout = this.hideMenu;
    container.menuContainerBgColor = this.menuContainerBgColor;
    for (var i=0; i<container.document.layers.length; i++) {
      proto = container.menus[i].prototypeStyles || this.prototypeStyles || container.menus[i];
      var menu = container.document.layers[i];
      container.menus[i].menuLayer = menu;
      container.menus[i].menuLayer.Menu = container.menus[i];
      container.menus[i].menuLayer.Menu.container = container;
      var body = menu.document.layers[0].document.layers[0];
      body.clip.width = proto.menuWidth || body.clip.width;
      body.clip.height = proto.menuHeight || body.clip.height;
      for (var n=0; n<body.document.layers.length-1; n++) {
        var l = body.document.layers[n];
        l.Menu = container.menus[i];
        l.menuHiliteBgColor = proto.menuHiliteBgColor;
        l.document.bgColor = proto.menuItemBgColor;
        l.saveColor = proto.menuItemBgColor;
        l.mouseout  = l.Menu.mouseouts[n];
        l.mouseover = l.Menu.mouseovers[n];
        l.onmouseover = proto.onMenuItemOver;
        l.onclick = proto.onMenuItemAction;
        l.action = container.menus[i].actions[n];
        l.focusItem = body.document.layers[body.document.layers.length-1];
        l.clip.width = proto.menuItemWidth || body.clip.width + proto.menuItemIndent;
        l.clip.height = proto.menuItemHeight || l.clip.height;
        if (n>0) l.top = body.document.layers[n-1].top + body.document.layers[n-1].clip.height + proto.menuItemBorder;
        l.hilite = l.document.layers[1];
        l.document.layers[1].isHilite = true;
        if (l.document.layers[0].id.indexOf("menuSeparator") != -1) {
          l.hilite = null;
          l.clip.height -= l.clip.height / 2;
          l.document.layers[0].document.bgColor = proto.bgColor;
          l.document.layers[0].clip.width = l.clip.width -2;
          l.document.layers[0].clip.height = 1;
          l.document.layers[1].document.bgColor = proto.menuLiteBgColor;
          l.document.layers[1].clip.width = l.clip.width -2;
          l.document.layers[1].clip.height = 1;
          l.document.layers[1].top = l.document.layers[0].top + 1;
        } else if (l.document.layers.length > 2) {
          l.childMenu = container.menus[i].items[n].menuLayer;
          l.icon = proto.childMenuIcon;
          l.iconHilite = proto.childMenuIconHilite;
          l.document.layers[2].left = l.clip.width -13;
          l.document.layers[2].top = (l.clip.height / 2) -4;
          l.document.layers[2].clip.left += 3;
          l.Menu.childMenus[l.Menu.childMenus.length] = l.childMenu;
        }
      }
      body.document.bgColor = proto.bgColor;
      body.clip.width  = l.clip.width +1;
      body.clip.height = l.top + l.clip.height +1;
      body.document.layers[n].clip.width = body.clip.width;
      body.document.layers[n].captureEvents(Event.MOUSEDOWN);
      body.document.layers[n].onmousedown = proto.onMenuItemDown;
      //body.document.layers[n].onfocus = proto.onMenuItemDown;
      body.document.layers[n].onmouseout = proto.onMenuItemOut;
      body.document.layers[n].Menu = l.Menu;
      body.document.layers[n].top = -30;
      menu.document.bgColor = proto.menuBorderBgColor;
      menu.document.layers[0].document.bgColor = proto.menuLiteBgColor;
      menu.document.layers[0].clip.width = body.clip.width +1;
      menu.document.layers[0].clip.height = body.clip.height +1;
      menu.clip.width = body.clip.width + (proto.menuBorder * 2) +1;
      menu.clip.height = body.clip.height + (proto.menuBorder * 2) +1;
      if (menu.Menu.enableTracker) {
        menu.Menu.disableHide = true;
        setMenuTracker(menu.Menu);
      }
    }
  } else if (container.document.all) {
    var menuCount = 0;
    for (var x=0; x<container.menus.length; x++) {
      var menu = container.document.all("menuLayer" + x);
      container.menus[x].menuLayer = menu;
      container.menus[x].menuLayer.Menu = container.menus[x];
      container.menus[x].menuLayer.Menu.container = menu;
      proto = container.menus[x].prototypeStyles || this.prototypeStyles || container.menus[x];
      proto.menuItemWidth = proto.menuItemWidth || 150;
      menu.style.backgroundColor = proto.menuBorderBgColor;
      for (var i=0; i<container.menus[x].items.length; i++) {
        var l = container.document.all["menuItem" + menuCount];
        l.Menu = container.menus[x];
        proto = container.menus[x].prototypeStyles || this.prototypeStyles || container.menus[x];
        l.style.pixelWidth = proto.menuItemWidth;
        l.style.pixelHeight = proto.menuItemHeight;
        if (i>0) l.style.pixelTop = container.document.all["menuItem" + (menuCount -1)].style.pixelTop + container.document.all["menuItem" + (menuCount -1)].style.pixelHeight + proto.menuItemBorder;
        l.style.fontSize = proto.fontSize;
        l.style.backgroundColor = proto.menuItemBgColor;
        l.style.visibility = "inherit";
        l.saveColor = proto.menuItemBgColor;
        l.menuHiliteBgColor = proto.menuHiliteBgColor;
        l.action = container.menus[x].actions[i];
        l.hilite = container.document.all["menuItemHilite" + menuCount];
        l.focusItem = container.document.all["focusItem" + x];
        l.focusItem.style.pixelTop = -30;
        l.mouseover = l.Menu.mouseovers[x];
        l.mouseout  = l.Menu.mouseouts[x];
        var childItem = container.document.all["childMenu" + menuCount];
        if (childItem) {
          l.childMenu = container.menus[x].items[i].menuLayer;
          childItem.style.pixelLeft = l.style.pixelWidth -11;
          childItem.style.pixelTop = (l.style.pixelHeight /2) -4;
          childItem.style.pixelWidth = 30 || 7;
          childItem.style.clip = "rect(0 7 7 3)";
          l.Menu.childMenus[l.Menu.childMenus.length] = l.childMenu;
        }
        var sep = container.document.all["menuSeparator" + menuCount];
        if (sep) {
          sep.style.clip = "rect(0 " + (proto.menuItemWidth - 3) + " 1 0)";
sep.style.pixelWidth = proto.menuItemWidth;
          sep.style.backgroundColor = proto.bgColor;
          sep = container.document.all["menuSeparatorLite" + menuCount];
          sep.style.clip = "rect(1 " + (proto.menuItemWidth - 3) + " 2 0)";
sep.style.pixelWidth = proto.menuItemWidth;
          sep.style.backgroundColor = proto.menuLiteBgColor;
          l.style.pixelHeight = proto.menuItemHeight/2;
          l.isSeparator = true
        }
        menuCount++;
      }
      proto.menuHeight = (l.style.pixelTop + l.style.pixelHeight);
      var lite = container.document.all["menuLite" + x];
      lite.style.pixelHeight = proto.menuHeight +2;
      lite.style.pixelWidth = proto.menuItemWidth + 2;
      lite.style.backgroundColor = proto.menuLiteBgColor;
      var body = container.document.all["menuFg" + x];
      body.style.pixelHeight = proto.menuHeight + 1;
      body.style.pixelWidth = proto.menuItemWidth + 1;
      body.style.backgroundColor = proto.bgColor;
      container.menus[x].menuLayer.style.pixelWidth  = proto.menuWidth || proto.menuItemWidth + (proto.menuBorder * 2) +2;
      container.menus[x].menuLayer.style.pixelHeight = proto.menuHeight + (proto.menuBorder * 2) +2;
      if (menu.Menu.enableTracker) {
        menu.Menu.disableHide = true;
        setMenuTracker(menu.Menu);
      }
    }
    container.document.all("menuContainer").style.backgroundColor = container.menus[0].menuContainerBgColor;
    container.document.saveBgColor = container.document.bgColor;
  }
  window.wroteMenu = true;

  window.defaultStatus = "The World of Nuclear Science";
}

function onMenuItemOver(e, l, a)
{
  l = l || this;
  a = a || window.ActiveMenuItem;
  if (document.layers) {
    if (a) {
      a.document.bgColor = a.saveColor;
      if (a.hilite) a.hilite.visibility = "hidden";
      if (a.childMenu) a.document.layers[1].document.images[0].src = a.icon;
    } else {
      a = new Object();
    }
    if (this.mouseover && this.id != a.id) {
      if (this.mouseover.length > 4) {
        var ext = this.mouseover.substring(this.mouseover.length-4);
        if (ext == ".gif" || ext == ".jpg") {
          this.document.layers[1].document.images[0].src = this.mouseover;
        } else {
          eval("" + this.mouseover);
        }
      }
    }
    if (l.hilite) {
      l.document.bgColor = l.menuHiliteBgColor;
      l.zIndex = 1;
      l.hilite.visibility = "inherit";
      l.hilite.zIndex = 2;
      l.document.layers[1].zIndex = 1;
      l.focusItem.zIndex = this.zIndex +2;
    }
    l.focusItem.top = this.top;
    l.Menu.hideChildMenu(l);
  } else if (l.style) {
    document.onmousedown=l.Menu.onMenuItemDown;
    if (a) {
      a.style.backgroundColor = a.saveColor;
      if (a.hilite) a.hilite.style.visibility = "hidden";
    } else {
      a = new Object();
    }
    if (l.mouseover && l.id != a.id) {
      if (l.mouseover.length > 4) {
        var ext = l.mouseover.substring(l.mouseover.length-4);
        if (ext == ".gif" || ext == ".jpg") {
          l.document.images[l.id + "Img"].src = l.mouseover;
        } else {
          eval("" + l.mouseover);
        }
      }
    }
    if (l.isSeparator) return;
    l.style.backgroundColor = l.menuHiliteBgColor;
    if (l.hilite) {
      l.style.backgroundColor = l.menuHiliteBgColor;
      l.hilite.style.visibility = "inherit";
    }
    l.focusItem.style.pixelTop = l.style.pixelTop;
    l.focusItem.style.zIndex = l.zIndex +1;
    l.zIndex = 1;
    l.Menu.hideChildMenu(l);
  }
  window.ActiveMenuItem = l;
}

function onMenuItemOut(e, l, a)
{
  l = l || this;
  a = a || window.ActiveMenuItem;
  if (l.id.indexOf("focusItem")) {
    if (a && l.top) {
      l.top = -30;
      if (a.mouseout && a.id != l.id) {
        if (a.mouseout.length > 4) {
          var ext = a.mouseout.substring(a.mouseout.length-4);
          if (ext == ".gif" || ext == ".jpg") {
            a.document.layers[1].document.images[0].src = a.mouseout;
          } else {
            eval("" + a.mouseout);
          }
        }
      }
    } else if (a && l.style) {
      document.onmousedown=null;
      window.event.cancelBubble=true;
      if (l.mouseout) {
        if (l.mouseout.length > 4) {
          var ext = l.mouseout.substring(l.mouseout.length-4);
          if (ext == ".gif" || ext == ".jpg") {
            l.document.images[l.id + "Img"].src = l.mouseout;
          } else {
            eval("" + l.mouseout);
          }
        }
      }
    }
  }
}

function onMenuItemAction(e, l)
{
  l = window.ActiveMenuItem;
  if (!l) return;
  if (!ActiveMenu.Menu.disableHide) hideActiveMenus(ActiveMenu.menuLayer);
  if (l.action)
    eval("" + l.action);
}

function showMenu(menu, x, y, child)
{
  if (!window.wroteMenu) return;
  if (document.layers) {
    if (menu) {
      var l = menu.menuLayer || menu;
      if (typeof(menu) == "string")
      {
        for (var n=0; n < menuContainers.length; n++)
        {
          l = menuContainers[n].menus[menu];
          for (var i=0; i<menuContainers[n].menus.length; i++)
          {
            if (menu == menuContainers[n].menus[i].label) l = menuContainers[n].menus[i].menuLayer;
            if (l) break;
          }
        }
        if (!l) return;
      }
      l.Menu.container.document.bgColor = null;
      l.left = 1;
      l.top = 1;
      hideActiveMenus(l);
      if (this.visibility) l = this;
      window.ActiveMenu = l;
      window.releaseEvents(Event.MOUSEMOVE|Event.MOUSEUP);
      setTimeout('if(window.ActiveMenu)window.ActiveMenu.Menu.setMouseTracker();', 300);
    } else {
      var l = child;
    }
    if (!l) return;
    for (var i=0; i<l.layers.length; i++) {        
      if (!l.layers[i].isHilite) 
        l.layers[i].visibility = "inherit";
      if (l.layers[i].document.layers.length > 0) 
        showMenu(null, "relative", "relative", l.layers[i]);
    }
    if (l.parentLayer) {
      if (x != "relative") 
        l.parentLayer.left = x || window.pageX || 0;
      if (l.parentLayer.left + l.clip.width > window.innerWidth) 
        l.parentLayer.left -= (l.parentLayer.left + l.clip.width - window.innerWidth);
      if (y != "relative") 
        l.parentLayer.top = y || window.pageY || 0;
      if (l.parentLayer.isContainer) {
        l.Menu.xOffset = window.pageXOffset;
        l.Menu.yOffset = window.pageYOffset;
        l.parentLayer.clip.width = window.ActiveMenu.clip.width +2;
        l.parentLayer.clip.height = window.ActiveMenu.clip.height +2;
        if (l.parentLayer.menuContainerBgColor) l.parentLayer.document.bgColor = l.parentLayer.menuContainerBgColor;
      }
    }
    l.visibility = "inherit";
    if (l.Menu) l.Menu.container.visibility = "inherit";
  } else if (document.all) {
    var l = menu.menuLayer || menu;
    hideActiveMenus(l);
    if (typeof(menu) == "string") {
      l = document.all[menu];
      for (var n=0; n < menuContainers.length; n++) {
        l = menuContainers[n].menus[menu];
        for (var i=0; i<menuContainers[n].menus.length; i++) {
          if (menu == menuContainers[n].menus[i].label) l = menuContainers[n].menus[i].menuLayer;
          if (l) break;
        }
      }
    }
    window.ActiveMenu = l;
    l.style.visibility = "inherit";
    if (x != "relative") 
      l.style.pixelLeft = x || (window.pageX + document.body.scrollLeft) || 0;
    if (y != "relative") 
      l.style.pixelTop = y || (window.pageY + document.body.scrollTop) || 0;
    l.Menu.xOffset = document.body.scrollLeft;
    l.Menu.yOffset = document.body.scrollTop;
  }
  if (menu) {
    window.activeMenus[window.activeMenus.length] = l;
  }
}

function hideMenu(e)
{
  var l = e || window.ActiveMenu;
  if (!l) return true;
  if (l.menuLayer) {
    l = l.menuLayer;
  } else if (this.visibility) {
    l = this;
  }
  if (l.menuLayer) {
    l = l.menuLayer;
  }
  var a = window.ActiveMenuItem;
  document.saveMousemove = document.onmousemove;
  document.onmousemove = mouseTracker;
  if (a && document.layers) {
    a.document.bgColor = a.saveColor;
    a.focusItem.top = -30;
    if (a.hilite) a.hilite.visibility = "hidden";
    if (a.childMenu) a.document.layers[1].document.images[0].src = a.icon;
    if (mDrag.oldX <= e.pageX+3 && mDrag.oldX >= e.pageX-3 && mDrag.oldY <= e.pageY+3 && mDrag.oldY >= e.pageY-3) {
      if (a.action && window.ActiveMenu) setTimeout('window.ActiveMenu.Menu.onMenuItemAction();', 2);
    } else if (document.saveMousemove == mDrag.doMenuDrag) {
      if (window.ActiveMenu) return true;
    }
  } else if (window.ActiveMenu && document.all) {
    document.onmousedown=null;
    if (a) {
      a.style.backgroundColor = a.saveColor;
      if (a.hilite) a.hilite.style.visibility = "hidden";
    }
    if (document.saveMousemove == mDrag.doMenuDrag) {
      return true;
    }
	}
  if (window.ActiveMenu) {
    if (window.ActiveMenu.Menu) {
      if (window.ActiveMenu.Menu.disableHide) return true;
      e = window.event || e;
      if (!window.ActiveMenu.Menu.enableHideOnMouseOut && e.type == "mouseout") return true;
    }
  }
  hideActiveMenus(l);
  return true;
}

function hideChildMenu(menuLayer)
{
  var l = menuLayer || this;
  for (var i=0; i < l.Menu.childMenus.length; i++) {
    if (document.layers) {
      l.Menu.childMenus[i].visibility = "hidden";
    } else if (document.all) {
      l.Menu.childMenus[i].style.visibility = "hidden";
    }
    l.Menu.childMenus[i].Menu.hideChildMenu(l.Menu.childMenus[i]);
  }
  if (l.childMenu) {
    if (document.layers) {
      l.Menu.container.document.bgColor = null;
      l.Menu.showMenu(null,null,null,l.childMenu.layers[0]);
      l.childMenu.zIndex = l.parentLayer.zIndex +1;
      l.childMenu.top = l.top + l.parentLayer.top + l.Menu.menuLayer.top;
      if (l.childMenu.left + l.childMenu.clip.width > window.innerWidth) {
        l.childMenu.left = l.parentLayer.left - l.childMenu.clip.width + l.Menu.menuLayer.top + 15;
        l.Menu.container.clip.left -= l.childMenu.clip.width;
      } else if (l.Menu.childMenuDirection == "left") {
        l.childMenu.left = l.parentLayer.left - l.parentLayer.clip.width;
        l.Menu.container.clip.left -= l.childMenu.clip.width;
      } else {
        l.childMenu.left = l.parentLayer.left + l.parentLayer.clip.width  + l.Menu.menuLayer.left -5;
      }
      l.Menu.container.clip.width += l.childMenu.clip.width +100;
      l.Menu.container.clip.height += l.childMenu.clip.height;
      l.document.layers[1].zIndex = 0;
      l.document.layers[1].document.images[0].src = l.iconHilite;
      l.childMenu.visibility = "inherit";
    } else if (document.all) {
      l.childMenu.style.zIndex = l.Menu.menuLayer.style.zIndex +1;
      l.childMenu.style.pixelTop = l.style.pixelTop + l.Menu.menuLayer.style.pixelTop;
      if (l.childMenu.style.pixelLeft + l.childMenu.style.pixelWidth > document.width) {
        l.childMenu.style.pixelLeft = l.childMenu.style.pixelWidth + l.Menu.menuLayer.style.pixelTop + 15;
      } else if (l.Menu.childMenuDirection == "left") {
        //l.childMenu.style.pixelLeft = l.parentLayer.left - l.parentLayer.clip.width;
      } else {
        l.childMenu.style.pixelLeft = l.Menu.menuLayer.style.pixelWidth + l.Menu.menuLayer.style.pixelLeft -5;
      }
      l.childMenu.style.visibility = "inherit";
    }
    if (!l.childMenu.disableHide) 
      window.activeMenus[window.activeMenus.length] = l.childMenu;
  }
}

function hideActiveMenus(l)
{
  if (!window.activeMenus) return;
  for (var i=0; i < window.activeMenus.length; i++) {
  if (!activeMenus[i]) return;
    if (activeMenus[i].visibility && activeMenus[i].Menu) {
      activeMenus[i].visibility = "hidden";
      activeMenus[i].Menu.container.visibility = "hidden";
      activeMenus[i].Menu.container.clip.left = 0;
    } else if (activeMenus[i].style) {
      activeMenus[i].style.visibility = "hidden";
    }
  }
  document.onmousemove = mouseTracker;
  window.activeMenus.length = 0;
}

function mouseTracker(e)
{
  e = e || window.Event || window.event;
  window.pageX = e.pageX || e.clientX;
  window.pageY = e.pageY || e.clientY;
}

function setMouseTracker()
{
  if (document.captureEvents) {
    document.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);
  }
  document.onmousemove = this.mouseTracker;
  document.onmouseup = this.hideMenu;
}

function setMenuTracker(menu)
{
  if (!window.menuTrackers) window.menuTrackers = new Array();
  menuTrackers[menuTrackers.length] = menu;
  window.menuTrackerID = setInterval('menuTracker()',10);
}

function menuTracker()
{
  for (var i=0; i < menuTrackers.length; i++) {
    if (!isNaN(menuTrackers[i].xOffset) && document.layers) {
      var off = parseInt((menuTrackers[i].xOffset - window.pageXOffset) / 10);
      if (isNaN(off)) off = 0;
      if (off < 0) {
        menuTrackers[i].container.left += -off;
        menuTrackers[i].xOffset += -off;
      } else if (off > 0) {
        menuTrackers[i].container.left += -off;
        menuTrackers[i].xOffset += -off;
      }
    }
    if (!isNaN(menuTrackers[i].yOffset) && document.layers) {
      var off = parseInt((menuTrackers[i].yOffset - window.pageYOffset) / 10);
      if (isNaN(off)) off = 0;
      if (off < 0) {
        menuTrackers[i].container.top += -off;
        menuTrackers[i].yOffset += -off;
      } else if (off > 0) {
        menuTrackers[i].container.top += -off;
        menuTrackers[i].yOffset += -off;
      }
    }
    if (!isNaN(menuTrackers[i].xOffset) && document.body) {
      var off = parseInt((menuTrackers[i].xOffset - document.body.scrollLeft) / 10);
      if (isNaN(off)) off = 0;
      if (off < 0) {
        menuTrackers[i].menuLayer.style.pixelLeft += -off;
        menuTrackers[i].xOffset += -off;
      } else if (off > 0) {
        menuTrackers[i].menuLayer.style.pixelLeft += -off;
        menuTrackers[i].xOffset += -off;
      }
    }
    if (!isNaN(menuTrackers[i].yOffset) && document.body) {
      var off = parseInt((menuTrackers[i].yOffset - document.body.scrollTop) / 10);
      if (isNaN(off)) off = 0;
      if (off < 0) {
        menuTrackers[i].menuLayer.style.pixelTop += -off;
        menuTrackers[i].yOffset += -off;
      } else if (off > 0) {
        menuTrackers[i].menuLayer.style.pixelTop += -off;
        menuTrackers[i].yOffset += -off;
      }
    }
  }
}

function onMenuItemDown(e, l)
{
  l = l || window.ActiveMenuItem || this;
  if (!l.Menu) {
  } else {
    if (document.layers) {
      mDrag.dragLayer = l.Menu.container;
      mDrag.startMenuDrag(e);
    } else {
      mDrag.dragLayer = l.Menu.container.style;
      mDrag.startMenuDrag(e);
      window.event.cancelBubble=true;
    }
  }
}

function startMenuDrag(e)
{
  if (document.layers) {
    if (e.which > 1) {
      if (window.ActiveMenu) ActiveMenu.Menu.container.visibility = "hidden";
      window.ActiveMenu = null;
      return true;
    }
    document.captureEvents(Event.MOUSEMOVE);
    var x = e.pageX;
    var y = e.pageY;
  } else {
    var x = window.event.clientX;
    var y = window.event.clientY;
  }
  mDrag.offX = x;
  mDrag.offY = y;
  mDrag.oldX = x;
  mDrag.oldY = y;
  if (!ActiveMenu.Menu.disableDrag) document.onmousemove = mDrag.doMenuDrag;
  return false;
}

function doMenuDrag(e)
{
  if (document.layers) {
    mDrag.dragLayer.moveBy(e.pageX-mDrag.offX,e.pageY-mDrag.offY);
    mDrag.offX = e.pageX;
    mDrag.offY = e.pageY;
  } else {
    mDrag.dragLayer.pixelLeft = window.event.offsetX;
    mDrag.dragLayer.pixelTop  = window.event.offsetY;
    return false; //for IE
  }
}




function getImagePageLeft(img)
{
  var x, obj;

  if (isMinNS4)
  {
    obj = document.images[img];
    if (obj.container)
      return obj.container.pageX + obj.x;
    else
      return document.images[img].x;
  }
  if (isMinIE4)//fixie
  {
    x = 0;
    obj = document.images[img];
    while (obj.offsetParent != null)
    {
      x += obj.offsetLeft;
      obj = obj.offsetParent;
    }
    x += obj.offsetLeft;
    return x;
  }
  return -1;
}

function getImagePageTop(img)
{
  var y, obj;

  if (isMinNS4)
  {
    obj = document.images[img];
    if (obj.container)
      return obj.container.pageY + obj.y;
    else
      return document.images[img].y;
  }
  if (isMinIE4)
  {
    y = 0;
    obj = document.images[img];
    while (obj.offsetParent != null)
    {
      y += obj.offsetTop;
      obj = obj.offsetParent;
    }
    y += obj.offsetTop;
    return y;
  }
  return -1;
}


function showMenuEx(menu, img)
{
  showMenu(menu, getImagePageLeft(img) + 150, getImagePageTop(img));
}



function onLoad()
{
  loadMenus();
}

function loadMenus()
{
window.atomMenu = new Menu("The Atom");
atomMenu.addMenuItem("Nucleons and The Atom", "location='/C004606/atom/atomnu.shtml'");
atomMenu.addMenuItem("Nuclear Binding Energy", "location='/C004606/atom/binding.shtml'");
atomMenu.addMenuItem("Radioactivity and Radioisotopes", "location='/C004606/atom/raddecay.shtml'");
atomMenu.addMenuItem("Fission", "location='/C004606/atom/fission.shtml'");
atomMenu.addMenuItem("Fusion", "location='/C004606/atom/fusion.shtml'");
atomMenu.menuWidth = 200;
atomMenu.menuItemWidth = 200;



window.histRadMenu = new Menu("Discovery of Radiation");
window.histRadMenu.addMenuItem("X-Rays and Radiation", "location='/C004606/history/xrayrad.shtml'");
window.histRadMenu.addMenuItem("Radioactive Elements", "location='/C004606/history/newpolrad.shtml'");

window.histExpMenu = new Menu("Exploring Radiation");
window.histExpMenu.addMenuItem("Exploration of Atomic Structure", "location='/C004606/history/explorerad.shtml'");
window.histExpMenu.addMenuItem("Mapping of the Atom", "location='/C004606/history/exploremap.shtml'");
window.histExpMenu.addMenuItem("Splitting the Atom", "location='/C004606/history/exploresplit.shtml'");
window.histExpMenu.addMenuItem("Race for Nuclear Power", "location='/C004606/history/race.shtml'");
histExpMenu.menuWidth = 200;
histExpMenu.menuItemWidth = 200;

window.histBioMenu = new Menu("Biographies");
window.histBioMenu.addMenuItem("W. Roentgen (1845-1923)", "location='/C004606/history/roentgen.shtml'");
window.histBioMenu.addMenuItem("H. Becquerel (1852-1908)", "location='/C004606/history/becquerel.shtml'");
window.histBioMenu.addMenuItem("M. Curie (1867-1934)", "location='/C004606/history/curie.shtml'");
window.histBioMenu.addMenuItem("E. Rutherford (1871-1937)", "location='/C004606/history/rutherford.shtml'");
window.histBioMenu.addMenuItem("L. Meitner (1878-1968)", "location='/C004606/history/meitner.shtml'");
histBioMenu.menuWidth = 175;
histBioMenu.menuItemWidth = 175;

window.histMenu = new Menu("History");
histMenu.addMenuItem("Introduction", "location='/C004606/history/introbegin.shtml'");
histMenu.addMenuItem(histRadMenu);
histMenu.addMenuItem(histExpMenu);
histMenu.addMenuItem("Development of Nuclear Power", "location='/C004606/history/develop.shtml'");
histMenu.addMenuItem(histBioMenu);
histMenu.menuWidth = 200;
histMenu.menuItemWidth = 200;


window.appWarMenu = new Menu("Types of Weapons");
appWarMenu.addMenuItem("Fission Weapons", "location='/C004606/applications/fissionwpn.shtml'");
appWarMenu.addMenuItem("Thermonuclear Weapons", "location='/C004606/applications/thermowpn.shtml'");
appWarMenu.menuWidth = 175;
appWarMenu.menuItemWidth = 175;

window.appReactMenu = new Menu("Types of Reactors");
appReactMenu.addMenuItem("Power", "location='/C004606/applications/electricity.shtml'");
appReactMenu.addMenuItem("Research", "location='/C004606/applications/resreact.shtml'");

window.appMenu = new Menu("Applications");
appMenu.addMenuItem("Science", "location='/C004606/applications/science.shtml'");
appMenu.addMenuItem("Measuring Radiation", "location='/C004606/applications/measuringrad.shtml'");
appMenu.addMenuItem("Reactors", "location='/C004606/applications/reactors.shtml'");
appMenu.addMenuItem(appReactMenu);
appMenu.addMenuItem("Medicine", "location='/C004606/applications/medicine.shtml'");
appMenu.addMenuItem("Food and Agriculture", "location='/C004606/applications/foodagriculture.shtml'");
appMenu.addMenuItem("Industry", "location='/C004606/applications/industry.shtml'");
appMenu.addMenuItem("Household", "location='/C004606/applications/household.shtml'");
appMenu.addMenuItem("Warfare", "location='/C004606/applications/warfare.shtml'");
appMenu.addMenuItem(appWarMenu);
appMenu.addMenuItem("Archaeology and Geology", "location='/C004606/applications/radioactivedating.shtml'");
appMenu.menuWidth = 175;
appMenu.menuItemWidth = 175;


window.interactResMenu = new Menu("Resources");
interactResMenu.addMenuItem("Reading List", "location='/C004606/gather/reading.shtml';");
interactResMenu.addMenuItem("Nuclear Science Links", "location='/C004606/gather/links.shtml';");

window.interactMenu = new Menu("Interact");
interactMenu.addMenuItem("Simulations", "location='/C004606/simulations.shtml';");
interactMenu.addMenuSeparator();
interactMenu.addMenuItem("Discussion Groups", "location='/C004606/gather/discussion.shtml';");
interactMenu.addMenuItem("Forums", "location='/C004606/gather/forums.shtml';");
interactMenu.addMenuItem("Polls", "location='/C004606/gather/polls.shtml';");
interactMenu.addMenuSeparator();
interactMenu.addMenuItem("Crossword", "location='/C004606/cross/cross.shtml';");
interactMenu.addMenuItem("Mission: Critical", "location='/C004606/game.shtml';");
interactMenu.addMenuSeparator();
interactMenu.addMenuItem(interactResMenu);


window.issuesMenu = new Menu("Issues");
issuesMenu.addMenuItem("Non-Proliferation Intro", "location='/C004606/issues/cntbtintro.shtml';");
issuesMenu.addMenuItem("The UN Test-Ban Treaty", "location='/C004606/issues/cntbt.shtml';");


window.otherUsMenu = new Menu("About Us");
otherUsMenu.addMenuItem("About Us", "location='/C004606/aboutus.shtml';");
otherUsMenu.addMenuItem("Biographies", "location='/C004606/biographies.shtml';");
otherUsMenu.addMenuItem("Contact Us", "location='/C004606/contact.shtml';");
otherUsMenu.addMenuItem("Send Feedback", "location='/C004606/contact.shtml';");
otherUsMenu.addMenuItem("Copyright", "location='/C004606/copyright.shtml';");

window.otherMenu = new Menu("Others");
otherMenu.addMenuItem("Home", "location='/C004606/english.shtml';");
otherMenu.addMenuItem("Site Map", "location='/C004606/sitemap.shtml';");
otherMenu.addMenuItem("Advanced Search", "location='/C004606/asearch.shtml';");
otherMenu.addMenuSeparator();
otherMenu.addMenuItem("Customise Site", "location='/C004606/customise.shtml';");
otherMenu.addMenuSeparator();
otherMenu.addMenuItem(otherUsMenu);
otherMenu.addMenuItem("Acknowledgements", "location='/C004606/acknowl.shtml';");
otherMenu.addMenuItem("Bibliography", "location='/C004606/biblio.shtml';");
otherMenu.addMenuSeparator();
otherMenu.addMenuItem("ThinkQuest", "window.open('http://www.thinkquest.org', '_blank');");


otherMenu.writeMenus();  //once for all
}


window.onresize = resize;
window.saveInnerWidth = window.innerWidth;
window.saveInnerHeight = window.innerHeight;

function resize()
{
  if (saveInnerWidth < window.innerWidth ||
    saveInnerWidth > window.innerWidth ||
    saveInnerHeight > window.innerHeight ||
    saveInnerHeight < window.innerHeight)
    window.location.reload();
}

function openGlossary(aword)
{
  glossarywnd = window.open("/C004606/glossary.shtml\#" + aword, "glossarywnd",
    "height=380,width=420,scrollbars=yes,location=no,menubar=no,personalbar=no,status=no,toolbar=no");
  if (navigator.userAgent.indexOf("MSIE") == -1)
    glossarywnd.focus();
}