//** Chrome Drop Down Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)

//** Updated: July 14th 06' to v2.0
	//1) Ability to "left", "center", or "right" align the menu items easily, just by modifying the CSS property "text-align".
	//2) Added an optional "swipe down" transitional effect for revealing the drop down menus.
	//3) Support for multiple Chrome menus on the same page.

//** Updated: Nov 14th 06' to v2.01- added iframe shim technique

//** Updated: July 23rd, 08 to v2.4
	//1) Main menu items now remain "selected" (CSS class "selected" applied) when user moves mouse into corresponding drop down menu. 
	//2) Adds ability to specify arbitrary HTML that gets added to the end of each menu item that carries a drop down menu (ie: a down arrow image).
	//3) All event handlers added to the menu are now unobstrusive, allowing you to define your own "onmouseover" or "onclick" events on the menu items.
	//4) Fixed elusive JS error in FF that sometimes occurs when mouse quickly moves between main menu items and drop down menus


var cssdropdown = {
    disappeardelay: 250, //set delay in miliseconds before menu disappears onmouseout
    dropdownindicator: '', //specify full HTML to add to end of each menu item with a drop down menu
    enableswipe: 0, //enable swipe effect? 1 for yes, 0 for no
    enableiframeshim: 1, //enable "iframe shim" in IE5.5/IE6? (1=yes, 0=no)

    //No need to edit beyond here////////////////////////

    dropmenuobj: null, asscmenuitem: null, domsupport: document.all || document.getElementById, standardbody: null, iframeshimadded: false, 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 totaloffset;
    },

    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)
    },

    css: function(el, targetclass, action) {
        var needle = new RegExp("(^|\\s+)" + targetclass + "($|\\s+)", "ig")
        if (action == "check")
            return needle.test(el.className)
        else if (action == "remove")
            el.className = el.className.replace(needle, "")
        else if (action == "add" && !needle.test(el.className)) {
            if (el.className.length > 0)
                el.className = targetclass + " " + el.className;
            else
                el.className = targetclass;
                
        }
    },

    showhide: function(obj, e) {
        this.dropmenuobj.style.left = this.dropmenuobj.style.top = "-500px"
        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"
        this.css(this.asscmenuitem, "selected", "add")
    },

    clearbrowseredge: function(obj, whichedge) {
        var edgeoffset = 0
        if (whichedge == "rightedge") {
            var windowedge = document.all && !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 = document.all && !window.opera ? this.standardbody.scrollTop : window.pageYOffset
            var windowedge = document.all && !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
            }
        }
        return edgeoffset
    },

    dropit: function(obj, e, dropmenuID) {
        if (this.dropmenuobj != null) //hide previous menu
            this.hidemenu() //hide menu
        this.clearhidemenu()
        this.dropmenuobj = document.getElementById(dropmenuID) //reference drop down menu
        this.asscmenuitem = obj //reference associated menu item
        this.showhide(this.dropmenuobj.style, e)
        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.dropmenuobj.style.top = this.dropmenuobj.y - this.clearbrowseredge(obj, "bottomedge") + obj.offsetHeight + "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'
    },

    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
    },

    dynamichide: function(m, e) {
        if (!this.isContained(m, e)) {
            this.delayhidemenu()
        }
    },

    delayhidemenu: function() {
        this.delayhide = setTimeout("cssdropdown.hidemenu()", this.disappeardelay) //hide menu
    },

    hidemenu: function() {
        this.css(this.asscmenuitem, "selected", "remove")
        this.dropmenuobj.style.visibility = 'hidden'
        this.dropmenuobj.style.left = this.dropmenuobj.style.top = 0
        this.hideshim()
    },

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

    addEvent: function(target, functionref, tasktype) {
        if (target.addEventListener)
            target.addEventListener(tasktype, functionref, false);
        else if (target.attachEvent)
            target.attachEvent('on' + tasktype, function() { return functionref.call(target, window.event) });
    },

    startchrome: function() {
        if (!this.domsupport)
            return
        this.standardbody = (document.compatMode == "CSS1Compat") ? document.documentElement : document.body
        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")
                    var asscdropdownmenu = document.getElementById(relvalue)
                    this.addEvent(asscdropdownmenu, function() { cssdropdown.clearhidemenu() }, "mouseover")
                    this.addEvent(asscdropdownmenu, function(e) { cssdropdown.dynamichide(this, e) }, "mouseout")
                    this.addEvent(asscdropdownmenu, function() { cssdropdown.delayhidemenu() }, "click")
                    try {
                        menuitems[i].innerHTML = menuitems[i].innerHTML + " " + this.dropdownindicator
                    } catch (e) { }
                    this.addEvent(menuitems[i], function(e) { //show drop down menu when main menu items are mouse over-ed
                        if (!cssdropdown.isContained(this, e)) {
                            var evtobj = window.event || e
                            cssdropdown.dropit(this, evtobj, this.getAttribute("rel"))
                        }
                    }, "mouseover")
                    this.addEvent(menuitems[i], function(e) { cssdropdown.dynamichide(this, e) }, "mouseout") //hide drop down menu when main menu items are mouse out
                    this.addEvent(menuitems[i], function() { cssdropdown.delayhidemenu() }, "click") //hide drop down menu when main menu items are clicked on
                }
            } //end inner for
        } //end outer for
        if (window.createPopup && !window.XmlHttpRequest && !this.iframeshimadded) { //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
            this.iframeshimadded = true
        }
    } //end startchrome

}