function toggleLayer(layerhide,layershow)
{
if (document.getElementById)
{
var style1 = document.getElementById(layerhide).style;
var style2 = document.getElementById(layershow).style;
style1.display = 'none';
style2.display = 'block';
}
else if (document.all)
{
var style1 = document.all[layerhide].style;
var style2 = document.all[layershow].style;
style1.display = 'none';
style2.display = 'block';
}
else if (document.layers)
{
var style1 = document.layers[layerhide].style;
var style2 = document.layers[layershow].style;
style1.display = 'none';
style2.display = 'block';
}
}