function toggleLayer(showLayer, hideLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var style2 = document.getElementById(showLayer).style;
style2.display = style2.display? "":"block";
var style3 = document.getElementById(hideLayer).style;
style3.display = style3.display? "block":"none";
	if (style2.display == "block")
	{
		style3.display = style3.display? "none":"block";
	}
}
else if (document.all)
{
// this is the way old msie versions work
var style2 = document.all[showLayer].style;
style2.display = style2.display? "":"block";
var style3 = document.getElementById(hideLayer).style;
style3.display = style3.display? "block":"none";
	if (style2.display == "block")
	{
		style3.display = style3.display? "none":"block";
	}
}
else if (document.layers)
{
// this is the way nn4 works
var style2 = document.layers[showLayer].style;
style2.display = style2.display? "":"block";
var style3 = document.getElementById(hideLayer).style;
style3.display = style3.display? "block":"none";
	if (style2.display == "block")
	{
		style3.display = style3.display? "none":"block";
	}
}
}