$(document).ready(
function()
{					
	$("#nav ul ul").css({display: "none"});
	$("#nav li").hover(function(){
		$(this).find('ul:first').css({visibility: "visible",display: "none"}).fadeIn(200);
		},function(){
		$(this).find('ul:first').css({visibility: "hidden"});
	});

	$("#nav li a[rel]").mouseover(
		function()
		{
			var img = "url(images/nav/m"+$(this).attr("rel")+".png)";
			$("#structure-menu").css("background-image",img).fadeIn(200);
		}
	);
	

});