//Drop Down/ Overlapping Content: http://www.dynamicdrive.com
//**Updated: Dec 19th, 07': Added ability to dynamically populate a Drop Down content using an external file (Ajax feature)
//**Updated: Feb 29th, 08':
        //1) Added ability to reveal drop down content via "click" of anchor link (instead of default "mouseover")
        //2) Added ability to disable drop down content from auto hiding when mouse rolls out of it
        //3) Added hidediv(id) public function to directly hide drop down div dynamically

//**Updated: Sept 11th, 08': Fixed bug whereby drop down content isn't revealed onClick of anchor in Safari/ Google Chrome

var dropdowncontent={
  disableanchorlink: false, //when user clicks on anchor link, should link itself be disabled (always true if "revealbehavior" above set to "click")
 hidedivmouseout: [true, 200], //Set hiding behavior within Drop Down DIV itself: [hide_div_onmouseover?, miliseconds_before_hiding]
  ajaxloadingmsg: "Loading Inventory Report...", //HTML to show while ajax page is being feched, if applicable
  ajaxbustcache: true, //Bust cache when fetching Ajax pages?

  getposOffset:function(what, offsettype){
    return (what.offsetParent)? what[offsettype]+this.getposOffset(what.offsetParent, offsettype) : what[offsettype]
  },

  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
  },

  show:function(anchorobj, subobj, e){
    if (!this.isContained(anchorobj, e) || (e && e.type=="click")){
      var e=window.event || e
      if (e.type=="click" && subobj.style.visibility=="visible"){
        subobj.style.visibility="hidden"
        return
      }
      var horizontaloffset=(subobj.dropposition[0]=="left")? -(subobj.offsetWidth-anchorobj.offsetWidth) : 0 //calculate user added horizontal offset
      var verticaloffset=(subobj.dropposition[1]=="top")? -subobj.offsetHeight : anchorobj.offsetHeight //calculate user added vertical offset      
      subobj.style.left=Math.min(861, this.getposOffset(anchorobj, "offsetLeft") + horizontaloffset) + "px"
      subobj.style.top=this.getposOffset(anchorobj, "offsetTop")+verticaloffset+"px"
      subobj.style.clip=(subobj.dropposition[1]=="top")? "rect(auto auto auto 0)" : "rect(0 auto 0 0)" //hide drop down box initially via clipping
      subobj.style.visibility="visible"
      subobj.startTime=new Date().getTime()
      subobj.contentheight=parseInt(subobj.offsetHeight)
      if (typeof window["hidetimer_"+subobj.id]!="undefined") //clear timer that hides drop down box?
        clearTimeout(window["hidetimer_"+subobj.id])
      this.slideengine(subobj, (subobj.dropposition[1]=="top")? "up" : "down")
    }
  },

  curveincrement:function(percent){
    return (1-Math.cos(percent*Math.PI)) / 2 //return cos curve based value from a percentage input
  },

  slideengine:function(obj, direction){
    var elapsed=new Date().getTime()-obj.startTime //get time animation has run
    if (elapsed<obj.glidetime){ //if time run is less than specified length
      var distancepercent=(direction=="down")? this.curveincrement(elapsed/obj.glidetime) : 1-this.curveincrement(elapsed/obj.glidetime)
      var currentclip=(distancepercent*obj.contentheight)+"px"
      obj.style.clip=(direction=="down")? "rect(0 auto "+currentclip+" 0)" : "rect("+currentclip+" auto auto 0)"
      window["glidetimer_"+obj.id]=setTimeout(function(){dropdowncontent.slideengine(obj, direction)}, 10)
    }
    else{ //if animation finished
      obj.style.clip="rect(0 auto auto 0)"
    }
  },

  hide:function(activeobj, subobj, e){
    if (!dropdowncontent.isContained(activeobj, e)){
      window["hidetimer_"+subobj.id]=setTimeout(function(){
        subobj.style.visibility="hidden"
        subobj.style.left=subobj.style.top=0
        clearTimeout(window["glidetimer_"+subobj.id])
      }, dropdowncontent.hidedivmouseout[1])
    }
  },

  hidediv:function(subobjid){
    document.getElementById(subobjid).style.visibility="hidden"
  },

  ajaxconnect:function(pageurl, divId){
    var page_request = false
    var bustcacheparameter=""
    if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc
      page_request = new XMLHttpRequest()
    else if (window.ActiveXObject){ // if IE6 or below
      try {
      page_request = new ActiveXObject("Msxml2.XMLHTTP")
      } 
      catch (e){
        try{
        page_request = new ActiveXObject("Microsoft.XMLHTTP")
        }
        catch (e){}
      }
    }
    else
      return false
    document.getElementById(divId).innerHTML=this.ajaxloadingmsg //Display "fetching page message"
    page_request.onreadystatechange=function(){dropdowncontent.loadpage(page_request, divId)}
    if (this.ajaxbustcache) //if bust caching of external page
      bustcacheparameter=(pageurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
    page_request.open('GET', pageurl+bustcacheparameter, true)
    page_request.send(null)
  },

  loadpage:function(page_request, divId){
    if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
      document.getElementById(divId).innerHTML=page_request.responseText
    }
  },
  
  initstat:function(anchorobj, url, pos, glidetime){      
      var subobj=document.getElementById(anchorobj.getAttribute("rel"))

      subobj.dropposition=pos.split("-")
      subobj.glidetime=glidetime || 1000
      subobj.style.left=subobj.style.top=0

      anchorobj.onmouseover=function(e){dropdowncontent.show(this, subobj, e)}
      anchorobj.onmouseout=function(e){dropdowncontent.hide(subobj, subobj, e)}
      if (this.disableanchorlink) anchorobj.onclick=function(){return false}

      if (this.hidedivmouseout[0]==true) //hide drop down DIV when mouse rolls out of it?
        subobj.onmouseout=function(e){dropdowncontent.hide(this, subobj, e)}

      var horizontaloffset=(subobj.dropposition[0]=="left")? -(subobj.offsetWidth-anchorobj.offsetWidth) : 0 //calculate user added horizontal offset
      var verticaloffset=(subobj.dropposition[1]=="top")? -subobj.offsetHeight : anchorobj.offsetHeight //calculate user added vertical offset      
      subobj.style.left=Math.min(810, this.getposOffset(anchorobj, "offsetLeft") + horizontaloffset) + "px"
      subobj.style.top=this.getposOffset(anchorobj, "offsetTop")+verticaloffset+"px"
      subobj.style.clip=(subobj.dropposition[1]=="top")? "rect(auto auto auto 0)" : "rect(0 auto 0 0)" //hide drop down box initially via clipping
      subobj.style.visibility="visible"

      subobj.startTime=new Date().getTime()
      subobj.contentheight=parseInt(subobj.offsetHeight)
      if (typeof window["hidetimer_"+subobj.id]!="undefined") //clear timer that hides drop down box?
        clearTimeout(window["hidetimer_"+subobj.id])
      this.slideengine(subobj, (subobj.dropposition[1]=="top")? "up" : "down")

      this.ajaxconnect(url, anchorobj.getAttribute("rel"))

    },


 init:function(anchorid, pos, glidetime, revealbehavior){
    var anchorobj=document.getElementById(anchorid)
    var subobj=document.getElementById(anchorobj.getAttribute("rel"))
    var subobjsource=anchorobj.getAttribute("rev")
    if (subobjsource!=null && subobjsource!="")
      this.ajaxconnect(subobjsource, anchorobj.getAttribute("rel"))
    subobj.dropposition=pos.split("-")
    subobj.glidetime=glidetime || 1000
    subobj.style.left=subobj.style.top=0
    if (typeof revealbehavior=="undefined" || revealbehavior=="mouseover"){
      anchorobj.onmouseover=function(e){dropdowncontent.show(this, subobj, e)}
      anchorobj.onmouseout=function(e){dropdowncontent.hide(subobj, subobj, e)}
      if (this.disableanchorlink) anchorobj.onclick=function(){return false}
    }
    else
      anchorobj.onclick=function(e){dropdowncontent.show(this, subobj, e); return false}
    if (this.hidedivmouseout[0]==true) //hide drop down DIV when mouse rolls out of it?
      subobj.onmouseout=function(e){dropdowncontent.hide(this, subobj, e)}
  }
}