<!--
var timeout         = 500;
var closetimer            = 0;
var ddmenuitem      = 0;
// open hidden layer
function mopen(id)
{      
      // cancel close timer
      mcancelclosetime();
      // 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 mclose()
{
      if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}
// go close timer
function mclosetime()
{
      closetimer = window.setTimeout(mclose, timeout);
}
// cancel close timer
function mcancelclosetime()
{
      if(closetimer)
      {
            window.clearTimeout(closetimer);
            closetimer = null;
      }
}
// close layer when click-out
document.onclick = mclose; 
// -->