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

var cssdropdown={
    disappeardelay: 2000, //set delay in miliseconds before menu disappears onmouseout
    disablemenuclick: true, //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 0;
    },

    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)
    },

    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(){cssdropdown.delayhidemenu()}
            obj.onclick=function(){return !cssdropdown.disablemenuclick} //disable main menu item link onclick?
            this.dropmenuobj=document.getElementById(dropmenuID)
            this.dropmenuobj.onmouseover=function(){cssdropdown.clearhidemenu()}
            this.dropmenuobj.onmouseout=function(e){cssdropdown.dynamichide(e)}
            this.dropmenuobj.onclick=function(){cssdropdown.delayhidemenu()}
            this.showhide(this.dropmenuobj.style, e)
            this.dropmenuobj.x=650//this.getposOffset(obj, "left")
            this.dropmenuobj.y=-10//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("cssdropdown.dropmenuobj.style.visibility='hidden'; cssdropdown.hideshim()",this.disappeardelay) //hide menu
    },

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

    startchrome: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
                            cssdropdown.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
            }
    }

}