$(document).ready(function(){
		$(".menu_top li").hover(function(){
			var vvv = $(this);
				$(".menu_top li").not(vvv).removeClass('hover'); 
				vvv.addClass('hover');
		},
		function(){
		var vvv = $(this);
				$(".menu_top li").not(vvv).removeClass('hover'); 
				vvv.removeClass('hover'); 
		});
});
var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;

function jsddm_open()
{	jsddm_canceltimer();
	jsddm_close();
	ddmenuitem = $(this).find('div').eq(0).css('visibility', 'visible');}

function jsddm_close()
{	if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}

function jsddm_timer()
{	closetimer = window.setTimeout(jsddm_close, timeout);}

function jsddm_canceltimer()
{	if(closetimer)
	{	window.clearTimeout(closetimer);
		closetimer = null;}}

$(document).ready(function()
{	
	$('.menu_top li').bind('mouseover', jsddm_open);
	$('.menu_top li').bind('mouseout',  jsddm_timer);

	});

document.onclick = jsddm_close;