/*************************************************************************
  This code is from Dynamic Web Coding at http://www.dyn-web.com/
  Copyright 2003 by Sharon Paine 
  See Terms of Use at http://www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!
*************************************************************************/

var menuLayers = {
  timer: null,
  activeMenuID: null,
  show: function(id, e) {
    var mnu = document.getElementById ? document.getElementById(id) : null;
    if ( !mnu ) return;
    this.activeMenuID = id;
    if ( mnu.onmouseout == null ) mnu.onmouseout = this.mouseoutCheck;
    if ( mnu.onmouseover == null ) mnu.onmouseover = this.clearTimer;
    this.timer = setTimeout("document.getElementById('" + menuLayers.activeMenuID + "').style.visibility = 'visible'", 200);
  },
  
  hide: function() {
    this.clearTimer();
    if (this.activeMenuID && document.getElementById) 
      this.timer = setTimeout("document.getElementById('"+menuLayers.activeMenuID+"').style.visibility = 'hidden'", 200);
  },
    
  mouseoutCheck: function(e) {
    e = e? e: window.event;
    // is element moused into contained by menu? or is it menu (ul or li or a to menu div)?
    var mnu = document.getElementById(menuLayers.activeMenuID);
    var toEl = e.relatedTarget? e.relatedTarget: e.toElement;
    if ( mnu != toEl && !menuLayers.contained(toEl, mnu) ) menuLayers.hide();
  },
  
  // returns true if oNode is contained by oCont (container)
  contained: function(oNode, oCont) {
    if (!oNode) return; // in case alt-tab away while hovering (prevent error)
    while ( oNode = oNode.parentNode ) 
      if ( oNode == oCont ) return true;
    return false;
  },

  clearTimer: function() {
    if (menuLayers.timer) clearTimeout(menuLayers.timer);
  }
  
}