//Drop Down Tabs Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Created: May 16th, 07'

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 + "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")
                if (document.getElementById(relvalue) != null) {
                
                    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"
        }
    }

}