// Autorem skryptu jest: SŁAWOMIR KOKŁOWSKI
// www.kurshtml.boo.pl
// Jeśli chcesz wykorzystać ten skrypt na swojej stronie, nie usuwaj tego komentarza!

// modyfikacje: Piotr Kasprzak

function tree(id)
{
  this.id = id;

  this.click = function ()
  {
   for (var i = 0, el_node; i < this.parentNode.childNodes.length; i++)
   {
     el_node = this.parentNode.childNodes.item(i)
     if (el_node.nodeName.toLowerCase() == 'ul')
     {
      el_node.style.display = el_node.style.display == 'none' ? 'block' : 'none';
      this.parentNode.className = (el_node.style.display == 'none' ? 'closed' : 'opened');
      return;
     }
   }
  }

  this.start = function (el)
  {
   for (var i = 0, el_node; i < el.childNodes.length; i++)
   {
     el_node = el.childNodes.item(i);
     if (el_node.nodeName.toLowerCase() == 'a')
     {
      el_node.onclick = this.click;
      for (var j = 0; j < el_node.parentNode.childNodes.length; j++)
      {
        if (el_node.parentNode.childNodes.item(j).nodeName.toLowerCase() == 'ul')
        {
         el_node.parentNode.className = (el_node.className ? el_node.className + ' ' : '') + 'closed';
         break;
        }
        if (el_node.parentNode.childNodes.item(j).nodeName.toLowerCase() == 'li') break;
      }
      if (el_node.href && unescape(el_node.href) == unescape(window.location.href))
      {  
        el_node.className = 'active';
        var el_parentNode = el_node.parentNode;
        do
        {
         el_parentNode = el_parentNode.parentNode;
         if (el_parentNode.nodeName.toLowerCase() == 'ul') el_parentNode.style.display = 'block';
         if (el_parentNode.nodeName.toLowerCase() == 'li') el_parentNode.className =  'opened';
        }
        while (document.getElementById(this.id) != el_parentNode)
      }
     }
     else if (el_node.nodeName.toLowerCase() == 'ul') { el_node.style.display = 'none'; }   
     this.start(el_node);
   }
  }

  if (document.getElementById && document.childNodes)
  {
   this.start(document.getElementById(this.id));
  }
}