function mainmenu(){
	if ($(" #main_navigation ul "))
	{
		$(" #main_navigation ul ").css({display: "none"}); // Opera Fix
		$(" #main_navigation li").hover(function(){
			$(this).find('ul:first').css({visibility: "visible",display: "none"}).show(200);
		},function(){
			$(this).find('ul:first').css({visibility: "hidden"});
		});
	}
}

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