//Drop Down Tabs Menu- Author: DynamicDr

var tabdropdown={
        disappeardelay: 200, //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?
        enableiframeshim: 1, //1 or 0, for true or false

        //No need to edit beyond here////////////////////////
        dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, previousmenuitem:null,
        currentpageurl: window.location.href.replace("http://"+window.location.hostname, "").replace(/^\//, ""), //get current page url (minus hostname, ie: http://www.dynamicdrive.com/)

        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, obj2){ //obj refers to drop down menu, obj2 refers to tab menu item mouse is currently over
                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 (obj2.parentNode.className.indexOf("default")==-1) //if tab isn't a default selected one
                                obj2.parentNode.className="selected"
                        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.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=this.ie && !window.opera? this.standardbody.scrollTop : window.pageYOffset
                        var windowedge=this.ie && !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
                        }
                        this.dropmenuobj.firstlink.style.borderTopWidth=(edgeoffset==0)? 0 : "1px" //Add 1px top border to menu if dropping up
                }
                return edgeoffset
        },

        dropit:function(obj, e, dropmenuID){
                if (this.dropmenuobj!=null){ //hide previous menu
                        this.dropmenuobj.style.visibility="hidden" //hide menu
                        if (this.previousmenuitem!=null && this.previousmenuitem!=obj){
                                if (this.previousmenuitem.parentNode.className.indexOf("default")==-1) //If the tab isn't a default selected one
                                        this.previousmenuitem.parentNode.className=""
                        }
                }
                this.clearhidemenu()
                if (this.ie||this.firefox){
                        obj.onmouseout=function(){tabdropdown.delayhidemenu(obj)}
                        obj.onclick=function(){return !tabdropdown.disablemenuclick} //disable main menu item link onclick?
                        this.dropmenuobj=document.getElementById(dropmenuID)
                        this.dropmenuobj.onmouseover=function(){tabdropdown.clearhidemenu()}
                        this.dropmenuobj.onmouseout=function(e){tabdropdown.dynamichide(e, obj)}
                        this.dropmenuobj.onclick=function(){tabdropdown.delayhidemenu(obj)}
                        this.showhide(this.dropmenuobj.style, e, obj)
                        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.previousmenuitem=obj //remember main menu item mouse moved out from (and into current menu item)
                        this.positionshim() //call iframe shim function
                }
        },

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

        dynamichide:function(e, obj2){ //obj2 refers to tab menu item mouse is currently over
                var evtobj=window.event? window.event : e
                if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement))
                        this.delayhidemenu(obj2)
                else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))
                        this.delayhidemenu(obj2)
        },

        delayhidemenu:function(obj2){
                this.delayhide=setTimeout(function(){tabdropdown.dropmenuobj.style.visibility='hidden'; if (obj2.parentNode.className.indexOf('default')==-1) obj2.parentNode.className=''},this.disappeardelay) //hide menu
        },

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

        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'
        },

isSelected:function(menuurl){
        var menuurl=menuurl.replace("http://"+menuurl.hostname, "").replace(/^\//, "")
        return (tabdropdown.currentpageurl==menuurl)
},

        init:function(menuid, dselected){
                this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body //create reference to common "body" across doctypes
                var menuitems=document.getElementById(menuid).getElementsByTagName("a")
                for (var i=0; i<menuitems.length; i++){
                        if (menuitems[i].getAttribute("rel")){
                                var relvalue=menuitems[i].getAttribute("rel")
                                document.getElementById(relvalue).firstlink=document.getElementById(relvalue).getElementsByTagName("a")[0]
                                menuitems[i].onmouseover=function(e){
                                        var event=typeof e!="undefined"? e : window.event
                                        tabdropdown.dropit(this, event, this.getAttribute("rel"))
                                }
                        }
                        if (dselected=="auto" && typeof setalready=="undefined" && this.isSelected(menuitems[i].href)){
                                menuitems[i].parentNode.className+=" selected default"
                                var setalready=true
                        }
                        else if (parseInt(dselected)==i)
                                menuitems[i].parentNode.className+=" selected default"
                }
        }

}