$(function() {
		// set opacity to nill on page load
		$(".menu_over").show();
    $(".menu_over").css("opacity","0");
		
		// on mouse over
		$(".menu_over").hover(function () {
			// animate opacity to full
			$(this).stop().animate({
				opacity: 1
			}, 'slow');
		}, 
		// on mouse out
		function () {
			// animate opacity to nill
			$(this).stop().animate({
				opacity: 0
			}, 'slow');
		}); 
	});