var selection = "overview";

function expand ( obj )
{
	if ( selection == document.getElementById( obj ).id ) { return; }
	document.getElementById( selection + 'Button' ).style.color = "#000";
	document.getElementById( selection + 'Button' ).style.fontWeight = "normal";
	document.getElementById( selection + 'Bar' ).style.display = "none";
	document.getElementById( selection + 'Header' ).style.display = "none";
	document.getElementById( selection ).style.display = "none";
	selection = document.getElementById( obj ).id;
	document.getElementById( obj ).style.display = ( document.getElementById( obj ).style.display == "inline" ) ? "none" : "inline";
	document.getElementById( selection + 'Button' ).style.color = "#fff";
	document.getElementById( selection + 'Button' ).style.fontWeight = "bold";
	document.getElementById( selection + 'Bar' ).style.display = "inline";
	document.getElementById( selection + 'Header' ).style.display = "inline";
}

function onHover ( obj )
{
	if ( selection == document.getElementById( obj ).id ) { return; }
	document.getElementById( obj + 'Button' ).style.color = "#bbb";
}

function offHover ( obj )
{
	if ( selection == document.getElementById( obj ).id ) { return; }
	document.getElementById( obj + 'Button' ).style.color = "#000";
}

function check ( form, answer )
{
	for ( i = 0; i < 5; i++) {
		if (form.rad[i].checked)
			break;
	}
	if ( i > 4 ) { form.result.value = "Please select an answer."; }
	form.result.value = ( i == answer )? "Correct!" : "Incorrect.";
}