$(document).ready(function() {

	$("#nav ul li a").mouseenter(function(event){

	var toLoad = $(this).attr('href'); 
			
	var selectedLink = $(this);
	var linkPosition = selectedLink.position();
	var linkPosLeft = linkPosition.left;
	
	var navMenuPosLeft = $("#nav").position().left;
	
	var aWidthh = $(this).width();
	var aHalfh = aWidthh / 2;
	var aCenterh = aHalfh - 8;
			
	var linkCenter = linkPosLeft + aCenterh;

	var ballPosAdjust = linkCenter - navMenuPosLeft;
	
	$(".circle").animate({"left": + ballPosAdjust}, "100" );
	});

});