function Toggle(item) {
	obj=document.getElementById(item);
	visible=(obj.style.display!="none")
	key="x" + item;
	if (visible) {
		obj.style.display="none";
		document.images[key].src="dnarrow.gif";
	} else {
		obj.style.display="block";
		document.images[key].src="uparrow.gif";
	}

}