function toggleLayer(whichLayer) 
{
	if (document.getElementById) {
	var style2 = document.getElementById(whichLayer).style; 
	style2.display = style2.display? "":"block";}

	else if (document.all) {
	var style2 = document.all[whichLayer].style;
	style2.display = style2.display? "":"block";}

	else if (document.layers) {
	var style2 = document.layers[whichLayer].style;
 	style2.display = style2.display? "":"block";} 
	
}