// JavaScript Document
function toggleLayer(whichLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var tab1 = document.getElementById('tabNorm').style;
tab1.display = "none";
var tab2 = document.getElementById('tabPic01').style;
tab2.display = "none";
var tab3 = document.getElementById('tabPic02').style;
tab3.display = "none";
var tab4 = document.getElementById('tabPic03').style;
tab4.display = "none";

var style2 = document.getElementById(whichLayer).style;
style2.display = "block";

}

}