// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download.
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

addEvent(window,"load",convertTrees);
function addEvent(o,e,f)
{
  if(o.addEventListener)
  {
    o.addEventListener(e,f,true);
    return true;
  }
  else if(o.attachEvent)
  {
    return o.attachEvent("on"+e,f);
  }
  else
  {
    return false;
  }
}

function setDefault(name,val)
{
  if(typeof(window[name])=="undefined" || window[name]==null)
  {
    window[name]=val;
  }
}

function expandTree(treeId)
{
  var ul = document.getElementById(treeId);
  if(ul == null)
  {
    return false;
  }
  expandCollapseList(ul,nodeOpenClass);
}

function collapseTree(treeId)
{
  var ul = document.getElementById(treeId);
  if(ul == null)
  {
    return false;
  }
  expandCollapseList(ul,nodeClosedClass);
}

function expandToItem(treeId,itemId)
{
  var ul = document.getElementById(treeId);
  if(ul == null)
  {
    return false;
  }
  var ret = expandCollapseList(ul,nodeOpenClass,itemId);
  if(ret)
  {
    var o = document.getElementById(itemId);
    if(o.scrollIntoView)
    {
      o.scrollIntoView(false);
    }
  }
}

function expandCollapseList(ul,cName,itemId)
{
  if(!ul.childNodes || ul.childNodes.length==0)
  {
    return false;
  }
  for(var itemi=0; itemi<ul.childNodes.length; itemi++)
  {
    var item = ul.childNodes[itemi];
    if(itemId!=null && item.id==itemId)
    {
      return true;
    }
    if(item.nodeName == "LI")
    {
      var subLists = false;
      for(var sitemi=0; sitemi<item.childNodes.length; sitemi++)
      {
        var sitem = item.childNodes[sitemi];
        if(sitem.nodeName=="UL")
        {
          subLists = true;
          var ret = expandCollapseList(sitem,cName,itemId);
          if(itemId!=null && ret)
          {
            item.className=cName;
            return true;
          }
        }
      }
      if(subLists && itemId==null)
      {
        item.className = cName;
      }
    }
  }
}

function convertTrees()
{
  setDefault("treeClass","mktree");
  setDefault("nodeInitialClass","liClosed");
  setDefault("nodeClosedClass","liClosed");
  setDefault("nodeOpenClass","liOpen");
  setDefault("nodeBulletClass","liBullet");
  setDefault("nodeLinkClass","bullet");
  setDefault("preProcessTrees",true);
  if(preProcessTrees)
  {
    if(!document.createElement)
    {
      return;
    }
    uls = document.getElementsByTagName("ul");
    for(var uli=0; uli<uls.length; uli++)
    {
      var ul=uls[uli];
      if(ul.nodeName=="UL" && ul.className==treeClass)
      {
        processList(ul);
      }
    }
  }
}

function processList(ul)
{
  if(!ul.childNodes || ul.childNodes.length==0)
  {
    return;
  }
  for(var itemi=0; itemi<ul.childNodes.length; itemi++)
  {
    var item = ul.childNodes[itemi];
    if(item.nodeName == "LI")
    {
      var subLists = false;
      for(var sitemi=0; sitemi<item.childNodes.length; sitemi++)
      {
        var sitem = item.childNodes[sitemi];
        if(sitem.nodeName=="UL")
        {
          subLists = true;
          processList(sitem);
        }
      }
      var s= document.createElement("SPAN");
      var t= '\u00A0';
      s.className = nodeLinkClass;
      if(subLists)
      {
        if(item.className==null || item.className=="")
        {
          //item.className = nodeClosedClass;
          item.className = nodeInitialClass;
        }
        if(item.firstChild.nodeName=="#text")
        {
          t = t+item.firstChild.nodeValue;
          item.removeChild(item.firstChild);
        }
        s.onclick = function()
        {
          this.parentNode.className =(this.parentNode.className==nodeOpenClass) ? nodeClosedClass : nodeOpenClass;
          return false;
        }
      }
      else
      {
        item.className = nodeBulletClass;
        s.onclick = function()
        {
          return false;
        }
      }
      s.appendChild(document.createTextNode(t));
      item.insertBefore(s,item.firstChild);
    }
  }
}