IDs in AJAX Loaded Documents

<![CDATA[function Callback(url, pathString) {
  this.url = url;
  this.filename = url.replace(/.*\//, "");
  this.path = pathString.split(/:/);
  var call = function(request) { this.container.callback.call(this.container, request) }
  call.container = this;
  loadXMLDocument(url, call);
}
Callback.prototype = new Function();
Callback.prototype.callback = function(request) {
  if(request.readyState == 4) {
    debug("Got: " + this.url + " (" + request.status + ")");
    if(request.status == 200) {
      var node = request.responseXML;
      for(var i = 0; i < this.path.length; i++) {
        node = node.childNodes.item(this.path[i]);
      }
      var id = node.getAttribute("id");
      debug(this.filename + ": tree ID: " + id);
      debug(this.filename + ": get by ID: " + request.responseXML.getElementById(id));
    }
    debugBreak();
  }
}
new Callback(window.location.pathname, "2:3:1");
new Callback(window.location.pathname.replace(/\.[^\.]+$/, ".xml"), "2:3:1");
new Callback(window.location.pathname, "2:3:7");
new Callback("test_javascript_document.xml", "0:1");
new Callback("test_javascript_document.xml", "0:3");
new Callback("test_javascript_document.xml", "0:5");]]>

Chebyshev's theorem