//Chrome Drop Down Menu v2.01- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: November 14th 06- added iframe shim technique

var drop_down_menu={
 disappeardelay: 250, //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?
 enableswipe: 1, //enable swipe effect? 1 for yes, 0 for no
 enableiframeshim: 1, //enable "iframe shim" technique to get drop down menus to correctly appear on top of controls such as form objects in IE5.5/IE6? 1 for yes, 0 for no

 //No need to edit beyond here////////////////////////
 dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, swipetimer: undefined, bottomclip:0,

 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;
 },

 swipeeffect:function(){
  if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight)){
   this.bottomclip+=10+(this.bottomclip/10) //unclip drop down menu visibility gradually
   this.dropmenuobj.style.clip="rect(0 auto "+this.bottomclip+"px 0)"
  }
  else
   return
  this.swipetimer=setTimeout("drop_down_menu.swipeeffect()", 25)
 },

 showhide:function(obj, e){
  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 (this.enableswipe==1){
     if (typeof this.swipetimer!="undefined")
      clearTimeout(this.swipetimer)
     obj.clip="rect(0 auto 0 0)" //hide menu via clipping
     this.bottomclip=0
     this.swipeeffect()
    }
    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.iecompattest().scrollLeft+this.iecompattest().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.iecompattest().scrollTop : window.pageYOffset
   var windowedge=this.ie && !window.opera? this.iecompattest().scrollTop+this.iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18
   this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetHeight
   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
   }
  }
  return edgeoffset
 },

 dropit:function(obj, e, dropmenuID){
  if (this.dropmenuobj!=null) //hide previous menu
   this.dropmenuobj.style.visibility="hidden" //hide menu
  this.clearhidemenu()
  if (this.ie||this.firefox){
   obj.onmouseout=function(){drop_down_menu.delayhidemenu()}
   obj.onclick=function(){return !drop_down_menu.disablemenuclick} //disable main menu item link onclick?
   this.dropmenuobj=document.getElementById(dropmenuID)
   this.dropmenuobj.onmouseover=function(){drop_down_menu.clearhidemenu()}
   this.dropmenuobj.onmouseout=function(e){drop_down_menu.dynamichide(e)}
   this.dropmenuobj.onclick=function(){drop_down_menu.delayhidemenu()}
   this.showhide(this.dropmenuobj.style, e)
   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.positionshim() //call iframe shim function
  }
 },

 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'
 },

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

 dynamichide:function(e){
  var evtobj=window.event? window.event : e
  if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement))
   this.delayhidemenu()
  else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))
   this.delayhidemenu()
 },

 delayhidemenu:function(){
  this.delayhide=setTimeout("drop_down_menu.dropmenuobj.style.visibility='hidden'; drop_down_menu.hideshim()",this.disappeardelay) //hide menu
 },

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

 start_menu:function(){
  for (var ids=0; ids<arguments.length; ids++){
   var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a")
   for (var i=0; i<menuitems.length; i++){
    if (menuitems[i].getAttribute("rel")){
     var relvalue=menuitems[i].getAttribute("rel")
     menuitems[i].onmouseover=function(e){
      var event=typeof e!="undefined"? e : window.event
      drop_down_menu.dropit(this,event,this.getAttribute("rel"))
     }
    }
   }
  }
  if (window.createPopup && !window.XmlHttpRequest){ //if IE5.5 to IE6, create iframe for iframe shim technique
   document.write('<IFRAME id="iframeshim"  src="" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>')
   this.shimobject=document.getElementById("iframeshim") //reference iframe object
  }
 }

}