var compatible = (document.getElementsByTagName && document.createElement);

/*
if (compatible)
  document.write('<link rel="stylesheet" href="navstyles.css" />')
*/

function initNavigation() {
  var lists = document.getElementsByTagName('ul');
  for (var i=0;i<lists.length;i++) {
    if (lists[i].className != 'menutree') continue;
    lists[i].onmouseover = navMouseOver;
    lists[i].onmouseout = navMouseOut;
    var listItems = lists[i].getElementsByTagName('li');
    for (var j=0;j<listItems.length;j++) {
      var test = listItems[j].getElementsByTagName('ul')[0];
      if (test) {
        listItems[j].firstChild.onfocus = navMouseOver;
        listItems[j].relatedItem = test;
      }
    }
  }
}

var currentlyOpenedMenus = new Array();
var currentlyFocusedItem;

function navMouseOver(e) {
  var evt = e || window.event;
  /*
  if(evt==null)
    alert("No event");
  else
    alert("Event");
  */
  //if(!confirm("evt="+evt))throw "ooops";
  var evtTarget = evt.target || evt.srcElement;
  //if(!confirm("evtTarget="+evtTarget))throw "ooops";

  if (evtTarget.nodeName.toUpperCase() == 'UL') return;
  while (evtTarget.nodeName.toUpperCase() != 'LI')
    evtTarget = evtTarget.parentNode;
  foldMenuIn(evtTarget);
  if (evtTarget.relatedItem && !evtTarget.relatedItem.opened) {
    evtTarget.className = 'highlight';
    evtTarget.relatedItem.className = 'foldOut';
    evtTarget.relatedItem.opened = true;
    currentlyOpenedMenus.push(evtTarget.relatedItem);
  }
}

function navMouseOut(e) {
  var evt = e || window.event;
  var relatedNode = evt.relatedTarget || evt.toElement;
  foldMenuIn(relatedNode);
}

function foldMenuIn(targetNode) {
  if (!targetNode) return;
  var newCurrentlyOpenedMenus = new Array();
  for (var i=0;i<currentlyOpenedMenus.length;i++) {
    if (!containsElement(currentlyOpenedMenus[i],targetNode)) {
      currentlyOpenedMenus[i].className = '';
      currentlyOpenedMenus[i].parentNode.className = '';
      currentlyOpenedMenus[i].opened = false;
    }
    else
      newCurrentlyOpenedMenus.push(currentlyOpenedMenus[i]);
  }
  currentlyOpenedMenus = newCurrentlyOpenedMenus;
}

function containsElement(obj1,obj2) {
  while (obj2.nodeName.toUpperCase() != 'HTML') {
    if (obj2 == obj1) return true;
    obj2 = obj2.parentNode;
  }
  return false;
}

addEventSimple(window,"load",initNavigation);

function addEventSimple(obj,evt,fn) {
  if (obj.addEventListener)
    obj.addEventListener(evt,fn,false);
  else if (obj.attachEvent)
    obj.attachEvent('on'+evt,fn);
}

function removeEventSimple(obj,evt,fn) {
  if (obj.removeEventListener)
    obj.removeEventListener(evt,fn,false);
  else if (obj.detachEvent)
    obj.detachEvent('on'+evt,fn);
}

/** PUSH AND SHIFT FOR IE5 **/

function Array_push() {
  var A_p = 0
  for (A_p = 0; A_p < arguments.length; A_p++) {
    this[this.length] = arguments[A_p]
  }
  return this.length
}

if (typeof Array.prototype.push == "undefined") {
  Array.prototype.push = Array_push
}

function Array_shift() {
  var A_s = 0
  var response = this[0]
  for (A_s = 0; A_s < this.length-1; A_s++) {
    this[A_s] = this[A_s + 1]
  }
  this.length--
  return response
}

if (typeof Array.prototype.shift == "undefined") {
  Array.prototype.shift = Array_shift
}