function toggleLayer(theDiv) {
	if (document.getElementById) {
		// this is the way the standards work
		var theStyle=document.getElementById(theDiv).style;
	}
	else if (document.all) {
		// this is the way old msie versions work
		var theStyle=document.all[theDiv].style;
	}
	else if (document.layers) {
		// this is the way nn4 works
		var theStyle=document.layers[theDiv].style;
	}
	if (theStyle.display=="none") {
		theStyle.display="block";
	}
	else {
		theStyle.display="none";	
	}
}