var timeout = 200;
var closetimer = 0;
var ddmenuitem = 0;

// open hidden layer
function mopen(id)
{  
   // cancel close timer
   avanquestclosetimer();

   // close old layer
   if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

   // get new layer and show it
   ddmenuitem = document.getElementById(id);
   ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function avanquestclose()
{
   if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function avanquesttimeclose()
{
   closetimer = window.setTimeout(avanquestclose, timeout);
}

// cancel close timer
function avanquestclosetimer()
{
   if(closetimer)
   {
      window.clearTimeout(closetimer);
      closetimer = null;
   }
}

// close layer when click-out
//document.onclick = avanquestclose;