// JavaScript Document
var locat = top.frames['content'].location.href , pos, number, n, current_slice;
var page = new Array();

page[1]="home.html";
page[2]="biotech/index.html"
page[3]="biology/index.html";
page[4]="biology/carbs/index.html";
page[5]="biology/proteins/index.html";
page[6]="biology/lipids/index.html";
page[7]="biology/dna/index.html";
page[8]="biology/rna/index.html";
page[9]="biology/dnaseq/index.html";
page[10]="products/index.html";
page[11]="products/recdna/index.html";
page[12]="products/recdna/about.html";
page[13]="products/scell/index.html";
page[14]="products/scell/about.html";
page[15]="products/drug/index.html";
page[16]="products/genet/index.html";
page[17]="products/bioweap/index.html";
page[18]="bioethics/index.html";
page[19]="bioethics/children.html";
page[20]="bioethics/cloning.html";
page[21]="bioethics/drugs.html";
page[22]="bioethics/life.html";
page[23]="bioethics/memory.html";
page[24]="bioethics/organs.html";
page[25]="bioethics/scells.html";
page[26]="bioethics/testing.html";
page[27]="bioethics/weapons.html";
page[28]="interviews/index.html";
page[29]="aboutus/index.html";
page[30]="glossary/glossary.html";
page[31]="sitemap.html";


for(n=locat.length;n>0;n--){
	if(locat.substring(n-4,n)=="/en/" || locat.substring(n-4,n)=="/es/"){
			pos=n;
			break;
		}
	}

current_slice=locat.slice(pos);
front_url=locat.substring(0,pos);
pos2 = current_slice.lastIndexOf("#"); 
if (pos2!=-1) current_slice =  current_slice .substring(0,pos2);   

for( n=0;n<page.length;n++){
	if(current_slice==page[n]){
		number=n;
		break;
		}
	}

function nextButton(){
	if(number==31){
		alert('You cannot go foward anymore');
		return;
	}
	var new_url= front_url+page[number+1];
	top.frames['content'].location.href  = new_url; 
}
function backButton(){
	if(number==1){
		alert('You cannot go back anymore');
		return;
		}
	var new_url= front_url+page[number-1];
	top.frames['content'].location.href  = new_url; 
}