//Drop Down Tabs Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Created: May 16th, 07'

var tabdropdown = {
  disappeardelay: 200, //set delay in miliseconds before menu disappears onmouseout
  disablemenuclick: false, //when user clicks on a menu item with a drop down menu, disable menu item's link?
  enableiframeshim: 1, //1 or 0, for true or false
  allowmoveup: 0, //1 or 0, for true or false

//No need to edit beyond here////////////////////////
  dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, previousmenuitem:null,
  currentpageurl: window.location.href.replace("http://"+window.location.hostname, "").replace(/^\//, ""), //get current page url (minus hostname, ie: http://www.dynamicdrive.com/)

  getposOffset:function(what, offsettype){
    var totaloffset = (offsettype == "left")? what.offsetLeft : what.offsetTop;
    var parentEl = what.offsetParent;
      while (parentEl != null){
        totaloffset = (offsettype == "left")? totaloffset + parentEl.offsetLeft : totaloffset + parentEl.offsetTop;
        parentEl = parentEl.offsetParent;
        }
    return totaloffset;
    },

  showhide:function(obj, e, obj2){ //obj refers to drop down menu, obj2 refers to tab menu item mouse is currently over
    if (this.ie || this.firefox)
      this.dropmenuobj.style.left = this.dropmenuobj.style.top = "-500px"
    if (e.type == "click" && obj.visibility == hidden || e.type == "mouseover") {
      if (obj2.parentNode.className.indexOf("default") == -1) //if tab isn't a default selected one
        obj2.parentNode.className = "selected"
      obj.visibility = "visible"
      }
    else if (e.type == "click")
      obj.visibility = "hidden"
    },

  iecompattest:function(){
    return (document.compatMode && document.compatMode != "BackCompat")? document.documentElement : document.body
    },

  clearbrowseredge:function(obj, whichedge){
    var edgeoffset = 0
    if (whichedge == "rightedge") {
      var windowedge = this.ie && !window.opera? this.standardbody.scrollLeft + this.standardbody.clientWidth - 15 : window.pageXOffset + window.innerWidth - 15
      this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetWidth
      if (windowedge-this.dropmenuobj.x < this.dropmenuobj.contentmeasure)  //move menu to the left?
        edgeoffset = this.dropmenuobj.contentmeasure - obj.offsetWidth
      }
    else {
      var topedge = this.ie && !window.opera? this.standardbody.scrollTop : window.pageYOffset
      var windowedge = this.ie && !window.opera? this.standardbody.scrollTop + this.standardbody.clientHeight - 15 : window.pageYOffset + window.innerHeight - 18
      this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetHeight
      if (this.allowmoveup) {
        if (windowedge - this.dropmenuobj.y < this.dropmenuobj.contentmeasure){ //move up?
          edgeoffset = this.dropmenuobj.contentmeasure + obj.offsetHeight
          if ((this.dropmenuobj.y - topedge) < this.dropmenuobj.contentmeasure) //up no good either?
            edgeoffset = this.dropmenuobj.y + obj.offsetHeight - topedge
          }
        this.dropmenuobj.firstlink.style.borderTopWidth = (edgeoffset == 0)? 0 : "1px" //Add 1px top border to menu if dropping up
        }
      }
    return edgeoffset
    },

  dropit:function(obj, e, dropmenuID){
    if (this.dropmenuobj != null){ //hide previous menu
      this.dropmenuobj.style.visibility = "hidden" //hide menu
      if (this.previousmenuitem != null && this.previousmenuitem != obj){
        if (this.previousmenuitem.parentNode.className.indexOf("default") == -1) //If the tab isn't a default selected one
          this.previousmenuitem.parentNode.className = ""
        }
      }
    this.clearhidemenu()
    if (this.ie || this.firefox) {
      obj.onmouseout = function(){tabdropdown.delayhidemenu(obj)}
      obj.onclick = function(){return !tabdropdown.disablemenuclick} //disable main menu item link onclick?
      this.dropmenuobj = document.getElementById(dropmenuID)
      this.dropmenuobj.onmouseover = function(){tabdropdown.clearhidemenu()}
      this.dropmenuobj.onmouseout = function(e){tabdropdown.dynamichide(e, obj)}
      this.dropmenuobj.onclick = function(){tabdropdown.delayhidemenu(obj)}
      this.showhide(this.dropmenuobj.style, e, obj)
      this.dropmenuobj.x = this.getposOffset(obj, "left")
      this.dropmenuobj.y = this.getposOffset(obj, "top")
      this.dropmenuobj.style.left = this.dropmenuobj.x - this.clearbrowseredge(obj, "rightedge") + "px"
      this.dropmenuobj.style.top = this.dropmenuobj.y - this.clearbrowseredge(obj, "bottomedge") + obj.offsetHeight + 1 + "px"
      this.previousmenuitem = obj //remember main menu item mouse moved out from (and into current menu item)
      this.positionshim() //call iframe shim function
      }
    },

  contains_firefox:function(a, b) {
    while (b.parentNode)
    if ((b = b.parentNode) == a)
      return true;
    return false;
    },

  dynamichide:function(e, obj2) { //obj2 refers to tab menu item mouse is currently over
    var evtobj = window.event? window.event : e
    if (this.ie && !this.dropmenuobj.contains(evtobj.toElement))
      this.delayhidemenu(obj2)
    else if (this.firefox && e.currentTarget != evtobj.relatedTarget && !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))
      this.delayhidemenu(obj2)
    },

  delayhidemenu:function(obj2) {
    this.delayhide = setTimeout(function(){tabdropdown.dropmenuobj.style.visibility = 'hidden'; if (obj2.parentNode.className.indexOf('default') == -1) obj2.parentNode.className = ''},this.disappeardelay) //hide menu
    },

  clearhidemenu:function() {
    if (this.delayhide != "undefined")
      clearTimeout(this.delayhide)
    },

  positionshim:function() { //display iframe shim function
    if (this.enableiframeshim && typeof this.shimobject != "undefined") {
      if (this.dropmenuobj.style.visibility == "visible") {
        this.shimobject.style.width = this.dropmenuobj.offsetWidth + "px"
        this.shimobject.style.height = this.dropmenuobj.offsetHeight + "px"
        this.shimobject.style.left = this.dropmenuobj.style.left
        this.shimobject.style.top = this.dropmenuobj.style.top
        }
      this.shimobject.style.display = (this.dropmenuobj.style.visibility == "visible")? "block" : "none"
      }
    },

  hideshim:function() {
    if (this.enableiframeshim && typeof this.shimobject != "undefined")
      this.shimobject.style.display = 'none'
    },

  isSelected:function(menuurl) {
    var menuurl = menuurl.replace("http://" + menuurl.hostname, "").replace(/^\//, "")
    return (tabdropdown.currentpageurl == menuurl)
    },

  init:function(menuid, dselected) {
    this.standardbody = (document.compatMode == "CSS1Compat")? document.documentElement : document.body //create reference to common "body" across doctypes
    var menuitems = document.getElementById(menuid).getElementsByTagName("a")
    for (var i=0; i<menuitems.length; i++) {
      if (menuitems[i].getAttribute("rel")) {
        var relvalue = menuitems[i].getAttribute("rel")
        document.getElementById(relvalue).firstlink = document.getElementById(relvalue).getElementsByTagName("a")[0]
        menuitems[i].onmouseover = function(e) {
          var event = typeof e != "undefined"? e : window.event
          tabdropdown.dropit(this, event, this.getAttribute("rel"))
          }
        }
      if (dselected == "auto" && typeof setalready == "undefined" && this.isSelected(menuitems[i].href)) {
        menuitems[i].parentNode.className += " selected default"
        var setalready = true
        }
      else if (parseInt(dselected) == i)
        menuitems[i].parentNode.className += " selected default"
      }
    }
  }