function DropdownNav(LayerID)  {

if (navigator.family == 'ie4' && navigator.version < 5){
	var obj = document.all[LayerID];              // IE 4 and below
	
	} else {
	var obj = document.getElementById(LayerID);   // IE 5
}	
	if (!obj) {
		alert(LayerID + " not found");
	} else {
	//alert(LayerID);
		if (obj.style.display == 'none') { 
			obj.style.display = 'block'; 
		} else {
			obj.style.display = 'none';
		}		
	}
}