function toggleLayer1(whichLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display= 'block';
var style2 = document.getElementById('d2').style;
style2.display = style2.display= 'none';	
var style2 = document.getElementById('d3').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d4').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d5').style;
style2.display = style2.display= 'none';
}
}
function toggleLayer2(whichLayer)
{
if (document.getElementById)
{

// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display= 'block';
var style2 = document.getElementById('d1').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d3').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d4').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d5').style;
style2.display = style2.display= 'none';
}
}

function toggleLayer3(whichLayer)
{
if (document.getElementById)
{

// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display= 'block';
var style2 = document.getElementById('d1').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d2').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d4').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d5').style;
style2.display = style2.display= 'none';
}
}
function toggleLayer4(whichLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display= 'block';
var style2 = document.getElementById('d1').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d2').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d3').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d5').style;
style2.display = style2.display= 'none';
}
}
function toggleLayer5(whichLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display= 'block';
var style2 = document.getElementById('d1').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d2').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d3').style;
style2.display = style2.display= 'none';
var style2 = document.getElementById('d4').style;
style2.display = style2.display= 'none';
}
}