function menu() {
    
    $(" #topmenu ul ").css({display: "none"}); // Opera Fix
    
    $(" #topmenu 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() {
    menu();
});