function toggleLayer(whichLayer)
{
 if (document.getElementById)
 {
 // this is the way the standards work
 var style2 = document.getElementById(whichLayer).style;
 style2.display = style2.display? "":"block";
 }

 else if (document.all)
 {
 // this is the way old msie versions work
 var style2 = document.all[whichLayer].style;
 style2.display = style2.display? "":"block";
 }

 else if (document.layers)

 {
 // this is the way nn4 works
 var style2 = document.layers[whichLayer].style;
 style2.display = style2.display? "":"block";
 }
}



















function hideLayer(whichLayer) {
if (document.getElementById) {
// this is the way the standards work
document.getElementById(whichLayer).style.visibility = "hidden";
}
else if (document.all) {
// this is the way old msie versions work
document.all[whichlayer].style.visibility = "hidden";
}
else if (document.layers) {
// this is the way nn4 works
document.layers[whichLayer].visibility = "hidden";
}
}



function showLayer(whichLayer) {

if (document.getElementById) {
// this is the way the standards work
//document.getElementById(whichLayer).style.visibility = "visible";
document.getElementById(whichLayer).style.display = "visible";
}
else if (document.all) {
// this is the way old msie versions work
//document.all[whichlayer].style.visibility = "visible";
document.all[whichlayer].style.visibility = "visible";

}
else if (document.layers) {
// this is the way nn4 works
//document.layers[whichLayer].visibility = "visible";
document.layers[whichLayer].display = "visible";
}
}