function mainmenu(){

    //by now prototype overwrote the $
    jQuery(" #nav ul ").css({display: "none"}); // Opera Fix
    jQuery(" #nav li").hover(function(){
            $(this).find('ul:first').css({visibility: "visible",display: "none"}).show(400);
            },function(){
            $(this).find('ul:first').css({visibility: "hidden"});
            });

}


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