// xCollapsible, Copyright 2004-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, 
//Distributed under the terms of the GNU LGPL

// xCollapsible, Copyright 2004-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xCollapsible(outerEle, bShow) // object prototype
{
  // Constructor

  var container = xGetElementById(outerEle);
  if (!container) {return null;}

  var isUL = container.nodeName.toUpperCase() == 'UL';

  var i, trg;
  var aTgt = xGetElementsByTagName(isUL ? 'UL':'DIV', container);
   
  for (i = 0; i < aTgt.length; ++i) {
    trg = xPrevSib(aTgt[i]);
    if (trg && (isUL || trg.nodeName.charAt(0).toUpperCase() == 'H')) {
      aTgt[i].xTrgPtr = trg;
      aTgt[i].style.display = bShow ? 'block' : 'none';
      trg.style.cursor = 'pointer';
      trg.xTgtPtr = aTgt[i];
      trg.onclick = trg_onClick;
    }  
  }
  
  ////////////////////// Private

  function trg_onClick()
  {
    var tgt = this.xTgtPtr.style;
    tgt.display = (tgt.display == 'none') ? "block" : "none";
  }

  ///////////////// Public

  this.displayAll = function(bShow)
  {
    for (var i = 0; i < aTgt.length; ++i) {
      if (aTgt[i].xTrgPtr) {
        aTgt[i].style.display = bShow ? "block" : "none";
      }
    }
  };

  //////////////////////// The unload listener is for IE's circular 
  ///////////////////////  reference memory leak bug.
  this.onUnload = function()
  {
    if (!container || !aTgt) {return;}
    for (i = 0; i < aTgt.length; ++i) {
      trg = aTgt[i].xTrgPtr;
      if (trg) {
        if (trg.xTgtPtr) {
          trg.xTgtPtr.TrgPtr = null;
          trg.xTgtPtr = null;
        }
        trg.onclick = null;
      }
    }
  };
}
////////////////////////////////
function xGetElementById(e)
{
  if(typeof(e)=='string') {
    if(document.getElementById) e=document.getElementById(e);
    else if(document.all) e=document.all[e];
    else e=null;
  }
  return e;
}

function xGetElementsByTagName(t,p)
{
  var list = null;
  t = t || '*';
  p = p || document;
  if (typeof p.getElementsByTagName != 'undefined') { // DOM1
    list = p.getElementsByTagName(t);
    if (t=='*' && (!list || !list.length)) list = p.all; // IE5 '*' bug
  }
  else { // IE4 object model
    if (t=='*') list = p.all;
    else if (p.all && p.all.tags) list = p.all.tags(t);
  }
  return list || new Array();
}


function xPrevSib(e,t)
{
  e = xGetElementById(e);
  var s = e ? e.previousSibling : null;
  while (s) {
    if (s.nodeType == 1 && (!t || s.nodeName.toLowerCase() == t.toLowerCase())){break;}
    s = s.previousSibling;
  }
  return s;
}