function mainmenu(){
$("#hnav li").hover(function(){
	if (/Safari[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ 
		$(this).find('ul:first').css({opacity:0, visibility: "visible"}).animate({opacity:1.0},400);
	}
	else {
		$(this).find('ul:first').css({visibility: "visible",display: "none"}).slideDown(200);
	}
		},function(){
		$(this).find('ul:first').css({visibility: "hidden"});
		});
}

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