var $y = jQuery.noConflict();

function mainmenu(){
$y(" .nav ul ").css({display: "none"}); // Opera Fix
$y(" .nav li").hover(function(){
		$y(this).find('ul:first').css({visibility: "visible",display: "none"}).slideDown(200);
		$y(this).addClass("current");
		},function(){
			$y(this).find('ul:first').css({visibility: "hidden"});
			$y(this).removeClass("current"); 
		});
} 
 
$y(document).ready(function(){
	mainmenu();
});