//** 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

//** Updated: Oct 29th, 08 to v2.5 (only .js file modified from v2.4)
	//1) Added ability to customize reveal animation speed (# of steps)
	//2) Menu now works in IE8 beta2 (a valid doctype at the top of the page is required)

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
    enablereveal: [true, 5], //enable swipe effect? [true/false, steps (Number of animation steps. Integer between 1-20. Smaller=faster)]
    enableiframeshim: 0, //enable "iframe shim" in IE5.5 to IE7? (1=yes, 0=no)
    offsetleft: 0,
    mozoffsetleft: -35,
    offsettop: -3,
    mozoffsettop: 35,

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

    dropmenuobj: null, asscmenuitem: null, domsupport: document.all || document.getElementById, standardbody: null, iframeshimadded: false, revealtimers: {},

    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;
    },

    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
    },

    showmenu:function(dropmenu, e){
            if (this.enablereveal[0]){
                    if (!dropmenu._trueheight || dropmenu._trueheight<10)
                            dropmenu._trueheight=dropmenu.offsetHeight
                    clearTimeout(this.revealtimers[dropmenu.id])
                    dropmenu.style.height=dropmenu._curheight=0
                    dropmenu.style.overflow="hidden"
                    dropmenu.style.visibility="visible"
                    this.revealtimers[dropmenu.id]=setInterval(function(){cssdropdown.revealmenu(dropmenu)}, 10)
            }
            else{
                    dropmenu.style.visibility="visible"
            }
            this.css(this.asscmenuitem, "selected", "add")
    },

    revealmenu:function(dropmenu, dir){
            var curH=dropmenu._curheight, maxH=dropmenu._trueheight, steps=this.enablereveal[1]
            if (curH<maxH){
                    var newH=Math.min(curH, maxH)
                    dropmenu.style.height=newH+"px"
                    dropmenu._curheight= newH + Math.round((maxH-newH)/steps) + 1
            }
            else{ //if done revealing menu
                    dropmenu.style.height="auto"
                    dropmenu.style.overflow="hidden"
                    clearInterval(this.revealtimers[dropmenu.id])
            }
    },

    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
                    var dropmenuW=this.dropmenuobj.offsetWidth
                    if (windowedge-this.dropmenuobj.x < dropmenuW)  //move menu to the left?
                            edgeoffset=dropmenuW-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
                    var dropmenuH=this.dropmenuobj._trueheight
                    if (windowedge-this.dropmenuobj.y < dropmenuH){ //move up?
                            edgeoffset=dropmenuH+obj.offsetHeight
                            if ((this.dropmenuobj.y-topedge)<dropmenuH) //up no good either?
                                    edgeoffset=this.dropmenuobj.y+obj.offsetHeight-topedge
                    }
            }
            return edgeoffset
    },

    dropit:function(obj, e, dropmenuID){
    		var browser = navigator.userAgent;
    		var ff = /(Firefox)/gi;
    		var ie = /MSIE/gi;

    		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.showmenu(this.dropmenuobj, e)
            this.dropmenuobj.x=this.getposOffset(obj, "left")
            this.dropmenuobj.y=this.getposOffset(obj, "top")

            if(browser.match(ff)) {
            	offsetLeft = this.mozoffsetleft;
            	offsetTop = this.offsettop;            		
            } else {
            	if(browser.match(ie)) {
            		offsetLeft = this.offsetleft;
                	offsetTop = this.offsettop;            		
            	} else {
            		offsetLeft = this.offsetleft;
                	offsetTop = this.mozoffsettop;            		
            	}
            }

    		this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+offsetLeft+"px"
            this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+offsetTop+"px"
            this.positionshim() //call iframe shim function
    },
    //display iframe shim function
    //IE�서만 �작한다..
    positionshim:function(){
            if (this.iframeshimadded){
                    if (this.dropmenuobj.style.visibility=="visible"){
                            this.shimobject.style.width=this.dropmenuobj.offsetWidth+"px"
                            this.shimobject.style.height=this.dropmenuobj._trueheight+"px"
                            // left가 오�작� 한다는거지..left가 변경�어� IE7�서는 위치� 변화가 없다...
                            this.shimobject.style.left=parseInt(this.dropmenuobj.style.left)+"px"
                            this.shimobject.style.top=parseInt(this.dropmenuobj.style.top)+"px"
                            //alert(this.shimobject.style.left);
                            this.shimobject.style.display="block"
                    }
            }
    },

    hideshim:function(){
            if (this.iframeshimadded)
                    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="-1000px"
            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(){
//    		alert(navigator.userAgent);
            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 (this.enableiframeshim && document.all && !window.XDomainRequest && !this.iframeshimadded){ //enable iframe shim in IE5.5 thru IE7?
                    document.write('<IFRAME id="iframeshim" src="about:blank" frameBorder="0" scrolling="no" style="left:0; top:0; position:absolute; display:none;z-index:90; background: transparent;"></IFRAME>')
                    this.shimobject=document.getElementById("iframeshim") //reference iframe object
                    this.shimobject.style.filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)'
                    this.iframeshimadded=true
            }
    } //end startchrome
}