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

    $(" #nav li").hover(
        
        function() { $('ul:first', this).css({ visibility: "visible", display: "block" }).show(400); },
        function() { $('ul:first', this).css({ visibility: "hidden" }); }

        );

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