//** Chrome Drop Down Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)

//** Updated: July 14th 06' to v2.0
 //1) Ability to "left", "center", or "right" align the menu items easily, just by modifying the CSS property "text-align".
 //2) Added an optional "swipe down" transitional effect for revealing the drop down menus.
 //3) Support for multiple Chrome menus on the same page.

//** Updated: Nov 14th 06' to v2.01- added iframe shim technique

//** Updated: July 23rd, 08 to v2.4
 //1) Main menu items now remain "selected" (CSS class "selected" applied) when user moves mouse into corresponding drop down menu.
 //2) Adds ability to specify arbitrary HTML that gets added to the end of each menu item that carries a drop down menu (ie: a down arrow image).
 //3) All event handlers added to the menu are now unobstrusive, allowing you to define your own "onmouseover" or "onclick" events on the menu items.
 //4) Fixed elusive JS error in FF that sometimes occurs when mouse quickly moves between main menu items and drop down menus


var cssdropdown={
disappeardelay: 250, //set delay in milliseconds before menu disappears onmouseout
dropdownindicator: '<img src="down.gif" border="0" />', //specify full HTML to add to end of each menu item with a drop down menu
enableswipe: 1, //enable swipe effect? 1 for yes, 0 for no
enableiframeshim: 1, //enable "iframe shim" in IE5.5/IE6? (1=yes, 0=no)

//No need to edit beyond here////////////////////////

dropmenuobj: null, asscmenuitem: null, domsupport: document.all || document.getElementById, standardbody: null, iframeshimadded: false, 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("cssdropdown.swipeeffect()", 10)
},

css:function(el, targetclass, action){
 var needle=new RegExp("(^|\\s+)"+targetclass+"($|\\s+)", "ig")
 if (action=="check")
  return needle.test(el.className)
 else if (action=="remove")
  el.className=el.className.replace(needle, "")
 else if (action=="add" && !needle.test(el.className))
  el.className+=" "+targetclass
},

showhide:function(obj, e){
 this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px"
 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"
 this.css(this.asscmenuitem, "selected", "add")
},

clearbrowseredge:function(obj, whichedge){
 var edgeoffset=0
 if (whichedge=="rightedge"){
  var windowedge=document.all && !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=document.all && !window.opera? this.standardbody.scrollTop : window.pageYOffset
  var windowedge=document.all && !window.opera? this.standardbody.scrollTop+this.standardbody.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.hidemenu() //hide menu
 this.clearhidemenu()
 this.dropmenuobj=document.getElementById(dropmenuID) //reference drop down menu
 this.asscmenuitem=obj //reference associated menu item
 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'
},

isContained:function(m, e){
 var e=window.event || e
 var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement)
 while (c && c!=m)try {c=c.parentNode} catch(e){c=m}
 if (c==m)
  return true
 else
  return false
},

dynamichide:function(m, e){
 if (!this.isContained(m, e)){
  this.delayhidemenu()
 }
},

delayhidemenu:function(){
 this.delayhide=setTimeout("cssdropdown.hidemenu()", this.disappeardelay) //hide menu
},

hidemenu:function(){
 this.css(this.asscmenuitem, "selected", "remove")
 this.dropmenuobj.style.visibility='hidden'
 this.dropmenuobj.style.left=this.dropmenuobj.style.top=0
 this.hideshim()
},

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

addEvent:function(target, functionref, tasktype){
 if (target.addEventListener)
  target.addEventListener(tasktype, functionref, false);
 else if (target.attachEvent)
  target.attachEvent('on'+tasktype, function(){return functionref.call(target, window.event)});
},

startchrome:function(){
 if (!this.domsupport)
  return
 this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body
 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")
    var asscdropdownmenu=document.getElementById(relvalue)
    this.addEvent(asscdropdownmenu, function(){cssdropdown.clearhidemenu()}, "mouseover")
    this.addEvent(asscdropdownmenu, function(e){cssdropdown.dynamichide(this, e)}, "mouseout")
    this.addEvent(asscdropdownmenu, function(){cssdropdown.delayhidemenu()}, "click")
    try{
     menuitems[i].innerHTML=menuitems[i].innerHTML+" "+this.dropdownindicator
    }catch(e){}
    this.addEvent(menuitems[i], function(e){ //show drop down menu when main menu items are mouse over-ed
     if (!cssdropdown.isContained(this, e)){
      var evtobj=window.event || e
      cssdropdown.dropit(this, evtobj, this.getAttribute("rel"))
     }
    }, "mouseover")
    this.addEvent(menuitems[i], function(e){cssdropdown.dynamichide(this, e)}, "mouseout") //hide drop down menu when main menu items are mouse out
    this.addEvent(menuitems[i], function(){cssdropdown.delayhidemenu()}, "click") //hide drop down menu when main menu items are clicked on
   }
  } //end inner for
 } //end outer for
 if (window.createPopup && !window.XmlHttpRequest &&!this.iframeshimadded){ //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
  this.iframeshimadded=true
 }
} //end startchrome

}