function AddNavigationArrow(elem) {
	var li = elem;
	while( li.tagName != 'LI' ) {
		li = li.parentNode;
	}
	
	li.style.background = "url("+ webroot +"/images/arrow.png) no-repeat center left";
}


function RemoveNavigationArrow(elem) {
	var li = elem;
	while( li.tagName != 'LI' ) {
		li = li.parentNode;
	}
	
	li.style.background = "#fff";
}