function toggleLayer(whichLayer, ShowHide)
{
if (document.getElementById)
{
 // this is the way the standards work
 var style2 = document.getElementById(whichLayer).style;
 if (ShowHide == "Show") {
 style2.display = "block"; }
 if (ShowHide == "Hide") {
 style2.display = ""; }
}
else if (document.all)
{
// this is the way old msie versions work
var style2 = document.all[whichLayer].style;
 if (ShowHide == "Show") {
 style2.display = "block"; }
 if (ShowHide == "Hide") {
 style2.display = ""; }
}
else if (document.layers)
{
// this is the way nn4 works
var style2 = document.layers[whichLayer].style;
 if (ShowHide == "Show") {
 style2.display = "block"; }
 if (ShowHide == "Hide") {
 style2.display = ""; }
}
}