function ShowHide(id1, id2) {
		  if (id1 != '') expMenu(id1);
		  if (id2 != '') expMenu(id2);
	}
	
	function expMenu(id) {
		var itm = null;
		if (document.getElementById) {
			itm = document.getElementById(id);
		} else if (document.all){
			itm = document.all[id];
		} else if (document.layers){
			itm = document.layers[id];
		}
		if (!itm) {
			// do nothing
		}
		else if (itm.style) {
			if (itm.style.display == "none") { itm.style.display = ""; }
		else { itm.style.display = "none"; }
		}
		else { itm.visibility = "show"; }
	}