function mainmenu(){
//$(" #primaryNavigation ul ").css({display: "none"}); // Opera Fix
 $(" #primaryNavigation li").hover(function(){
 $(this).find('ul:first:hidden').css({opacity:0.9,visibility:"visible"}).show(400);
 },function(){
$(this).find('ul:first').css({visibility:"hidden"});
});
} 
 $(document).ready(function(){					
	mainmenu();
});