addLoadEvent(navMenu);

function navMenu() {

	if (!document.getElementById) return false;
	if (!document.getElementById('main_navigation')) return false;
	var nav = document.getElementById('main_navigation');
	var uls = nav.getElementsByTagName('ul');
	for (var i=0;i<uls.length;i++) {
		var ul = uls[i];
		ul.onmouseover = function() {
			positionNav(this);
		}
	}
}
function positionNav(ul) {
	ul.parentNode.style.backgroundPosition='top right';

}