function top_menu_slide(){
	$(" #top_nav ul ").css({display: "none"}); // Opera Fix
	$(" #top_nav li").hover(function(){
		$(this).find('ul:first').css({visibility: "visible",display: "none"}).fadeTo(400,0.9);
	},function(){
		$(this).find('ul:first').css({visibility: "hidden"});
	});
}

$(document).ready(function(){
	top_menu_slide();
});