var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;

function menuTop_open(){ 
	menuTop_canceltimer();
	menuTop_close();
	ddmenuitem = $(this).find('ul').css('visibility', 'visible');
}

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

function menuTop_timer(){  
	closetimer = window.setTimeout(menuTop_close, timeout);
}

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

$(document).ready(function(){
	$('#menuTop > li').bind('mouseover', menuTop_open)
	$('#menuTop > li').bind('mouseout',  menuTop_timer)});

document.onclick = menuTop_close;