arrowOn = new Image();
arrowOn.src = baseurl + "/img/menu_arrow1.gif";
arrowOff = new Image();
arrowOff.src = baseurl + "/img/menu_arrow2.gif";

function menuOn(name) {
	var img = name + 'img';
	eval('document.images.' + name + '.src = arrowOn.src');
}

function menuOff(name) {
	var img = name + 'img';
	eval('document.images.' + name + '.src = arrowOff.src');
}