var divs = document.getElementsByTagName("div");

function selectLayer1(id)
{
var Showdiv = id.split("_");
var pdiv = Showdiv[0];
var pdivkey = Showdiv[1];
for(i=0;i<divs.length;i++)
{var divArr = divs[i].id.split("_");
if(divArr[0] == pdiv)
{if(divArr[1] == pdivkey)
{getbyid(id).style.display="block";}
else{if(divArr[1] == "nav")
{if(divArr[2] == pdivkey)
{getbyid(divs[i].id).className = "currentnav";}
else{getbyid(divs[i].id).className = "subnav";}}
else{getbyid(divs[i].id).style.display="none";}}}}
}

function getbyid(id)
{
if (document.getElementById) 
{return document.getElementById(id);} 
else if (document.all)
{return document.all[id];}
else if (document.layers)
{return document.layers[id];}
else {return null;}
}