window.addEvent('domready', function(){
	
	var navitems = $$('#nav li a');
	var navlist = $('navlist');

	var selectedball = $('selectedball');
	
	var where = $('selected').getPosition($('header')).x + ($('selected').getSize().x / 2) - 10;
	selectedball.setStyles({
		'left': where,
		'visibility': 'visible'
	});
	
	navitems.each(function(navitem, index){
		
		navitem.addEvent('mouseenter', function() {
												
			var where = navitem.getPosition($('header')).x + (navitem.getSize().x / 2) - 10;
			selectedball.set('tween', {transition: 'back:out'});
			selectedball.tween('left', where);
			
		});
		
	});

	$('nav').addEvent('mouseleave', function() {

			var where = $('selected').getPosition($('header')).x + ($('selected').getSize().x / 2) - 10;
			selectedball.tween('left', where);
	
	});

});