//Chrome Drop Down Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: Jan 1st, 06'


var cssdropdown={
disappeardelay: 0, //set delay in miliseconds before menu disappears onmouseout

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

    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, visible, hidden){
        if (this.ie || this.firefox)
        this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px"
        if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
            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"
        this.clearhidemenu()
        if (this.ie||this.firefox){
            obj.onmouseout=function(){cssdropdown.delayhidemenu()}
            this.dropmenuobj=document.getElementById(dropmenuID)
            this.dropmenuobj.onmouseover=function(){cssdropdown.clearhidemenu()}
            this.dropmenuobj.onmouseout=function(){cssdropdown.dynamichide(e)}
            this.dropmenuobj.onclick=function(){cssdropdown.delayhidemenu()}
            this.showhide(this.dropmenuobj.style, e, "visible", "hidden")
            this.dropmenuobj.x=this.getposOffset(obj, "left")
            this.dropmenuobj.y=this.getposOffset(obj, "top")
            this.dropmenuobj.style.left="0px"
            this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px"
        }
    },

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