var ddtreemenu=new Object()

ddtreemenu.closefolder="closed.gif" //set image path to "closed" folder image
ddtreemenu.openfolder="./open.gif" //set image path to "open" folder image

//////////No need to edit beyond here///////////////////////////

ddtreemenu.createTree=function(treeid) {
  var ultags=document.getElementById(treeid).getElementsByTagName("ul")

  for (var i=0; i<ultags.length; i++)
    ddtreemenu.buildSubTree(treeid, ultags[i], i)

}


ddtreemenu.buildSubTree=function(treeid, ulelement, index)
{
  ulelement.parentNode.className="submenu"
  if (ulelement.getAttribute("rel")==null || ulelement.getAttribute("rel")==false) 
    //if UL has NO rel attribute explicted added by user
    ulelement.setAttribute("rel", "closed")
  else if (ulelement.getAttribute("rel")=="open") //else if no cookie and this UL has an explicit rel value of "open"
    ddtreemenu.expandSubTree(treeid, ulelement) //expand this UL plus all parent ULs (so the most inner UL is revealed!)

  ulelement.parentNode.onclick=function(e)
  {
    var submenu=this.getElementsByTagName("ul")[0]
    if (submenu.getAttribute("rel")=="closed")
	{
      submenu.style.display="block"
      submenu.setAttribute("rel", "open")
      //ulelement.parentNode.style.backgroundImage="url("+ddtreemenu.openfolder+")"
    }
    else if (submenu.getAttribute("rel")=="open")
	{
      submenu.style.display="none"
      submenu.setAttribute("rel", "closed")
      //ulelement.parentNode.style.backgroundImage="url("+ddtreemenu.closefolder+")"
    }
    ddtreemenu.preventpropagate(e)
  }

  ulelement.onclick=function(e)
  {
    ddtreemenu.preventpropagate(e)
  }
}


ddtreemenu.expandSubTree=function(treeid, ulelement)
{ //expand a UL element and any of its parent ULs
  var rootnode=document.getElementById(treeid)
  var currentnode=ulelement

  currentnode.style.display="block"
  
  while (currentnode!=rootnode)
  {
    if (currentnode.tagName=="UL")
    { //if parent node is a UL, expand it too
      currentnode.style.display="block"
      currentnode.setAttribute("rel", "open") //indicate it's open
      //currentnode.parentNode.style.backgroundImage="url("+ddtreemenu.openfolder+")"
    }
    currentnode=currentnode.parentNode
  }
}



ddtreemenu.flatten=function(treeid, action)
{ //expand or contract all UL elements
  var ultags=document.getElementById(treeid).getElementsByTagName("ul")
  for (var i=0; i<ultags.length; i++)
  {
    ultags[i].style.display=(action=="expand")? "block" : "none"
    var relvalue=(action=="expand")? "open" : "closed"
    ultags[i].setAttribute("rel", relvalue)
  }
}



ddtreemenu.searcharray=function(thearray, value)
{ //searches an array for the entered value. If found, delete value from array
  var isfound=false
  for (var i=0; i<thearray.length; i++)
  {
    if (thearray[i]==value)
	{
      isfound=true
      thearray.shift() //delete this element from array for efficiency sake
      break
    }
  }
  return isfound
}


ddtreemenu.preventpropagate=function(e)
{ //prevent action from bubbling upwards
  if (typeof e!="undefined")
    e.stopPropagation()
  else
    event.cancelBubble=true
}


ddtreemenu.dotask=function(target, functionref, tasktype)
{ //assign a function to execute to an event handler (ie: onunload)
  var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
  if (target.addEventListener)
    target.addEventListener(tasktype, functionref, false)
  else if (target.attachEvent)
    target.attachEvent(tasktype, functionref)
}