// JavaScript Document
function toggleLayer(whichLayer){
	if (document.getElementById){
	// this is the way the standards work
		var style = document.getElementById(whichLayer).style;
		style.display = style.display? "":"block";
	}
	else if (document.all){
	// this is the way old msie versions work
		var style = document.all[whichLayer].style;
		style.display = style.display? "":"block";
	}
	else if (document.layers){
	// this is the way nn4 works
		var style = document.layers[whichLayer].style;
		style.display = style.display? "":"block";
	}
}