//** 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: '<img src="http://www.zimmerei-langer.de/bilder/down.gif" border="0" />', //specify full HTML to add to end of each menu item with a drop down menu
enableswipe: 1, //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))
                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")+-1+"px"
        this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+6+"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

}