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.style.backgroundImage = 'url("' + (el_node.style.display == 'none' ? 'open' : 'close') + '.gif")';
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.style.backgroundImage = 'url("")';
el_node.className = (el_node.className ? el_node.className + ' ' : '') + 'folder';
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;
do
{
el_parentNode = el_parentNode.parentNode;
if (el_parentNode.nodeName.toLowerCase() == 'ul')
{
el_parentNode.style.display = 'block';
if (document.getElementById(this.id) != el_parentNode) el_parentNode.parentNode.style.backgroundImage = 'url("")';
}
}
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)
{
if (document.images)
{
new Image().src = '';
new Image().src = '';
}
this.start(document.getElementById(this.id));
}
}