var timerID = false;
var menuopen = '';

function on(obj)
{
 if(menuopen != '') close(menuopen);
 obj.className = "on";
 menuopen = obj;
}

function off(obj)
{
 menu = obj;
 timerID = setTimeout('close(menu)',1000);
}

function close(obj)
{
 obj.className = "off";
 menuopen = '';
 clearTimeout(timerID);
}