// Copyright 2006-2007 javascript-array.com

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;