//** AnyLink JS Drop Down Menu v2.0- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Script Download/ instructions page: http://www.dynamicdrive.com/dynamicindex1/dropmenuindex.htm
//** January 29th, 2009: Script Creation date

//**May 22nd, 09': v2.1
	//1) Automatically adds a "selectedanchor" CSS class to the currrently selected anchor link
	//2) For image anchor links, the custom HTML attributes "data-image" and "data-overimage" can be inserted to set the anchor's default and over images.

//**June 1st, 09': v2.2
	//1) Script now runs automatically after DOM has loaded. anylinkmenu.init) can now be called in the HEAD section

if (typeof dd_domreadycheck=="undefined") //global variable to detect if DOM is ready
	var dd_domreadycheck=false

var anylinkmenu	=
{
	menusmap: {},
	preloadimages: [],
	effects: {delayhide: 200, shadow:{enabled:true, opacity:0.3, depth: [5, 5]}, fade:{enabled:false, duration:500}}, 
	//customize menu effects

	dimensions: {},

	getoffset:function(what, offsettype)
	{
		return (what.offsetParent)? what[offsettype]+this.getoffset(what.offsetParent, offsettype) : what[offsettype]
	},

	getoffsetof:function(el)
	{
		el._offsets={left:this.getoffset(el, "offsetLeft"), top:this.getoffset(el, "offsetTop"), h: el.offsetHeight}
	},

	getdimensions:function(menu)
	{
		this.dimensions	=
		{
			anchorw:menu.anchorobj.offsetWidth, anchorh:menu.anchorobj.offsetHeight,
			docwidth:(window.innerWidth ||this.standardbody.clientWidth)-20,
			docheight:(window.innerHeight ||this.standardbody.clientHeight)-15,
			docscrollx:window.pageXOffset || this.standardbody.scrollLeft,
			docscrolly:window.pageYOffset || this.standardbody.scrollTop
		}
		if (!this.dimensions.dropmenuw)
		{
			this.dimensions.dropmenuw=menu.dropmenu.offsetWidth
			this.dimensions.dropmenuh=menu.dropmenu.offsetHeight
		}
	},

	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
	},

	setopacity:function(el, value)
	{
		el.style.opacity=value
		if (typeof el.style.opacity!="string")
		{ 
			//if it's not a string (ie: number instead), it means property not supported
			el.style.MozOpacity=value
			if (el.filters)
			{
				el.style.filter="progid:DXImageTransform.Microsoft.alpha(opacity="+ value*100 +")"
			}
		}
	},

	showmenu:function(menuid)
	{
		var menu=anylinkmenu.menusmap[menuid]
		clearTimeout(menu.hidetimer)
		this.getoffsetof(menu.anchorobj)
		this.getdimensions(menu)
		var posx=menu.anchorobj._offsets.left + (menu.orientation=="lr"? this.dimensions.anchorw : 0) //base x pos
		var posy=menu.anchorobj._offsets.top+this.dimensions.anchorh - (menu.orientation=="lr"? this.dimensions.anchorh : 0)//base y pos
		if (posx+this.dimensions.dropmenuw+this.effects.shadow.depth[0]>this.dimensions.docscrollx+this.dimensions.docwidth)
		{ 
			//drop left instead?
			posx=posx-this.dimensions.dropmenuw + (menu.orientation=="lr"? -this.dimensions.anchorw : this.dimensions.anchorw)
		}
		if (posy+this.dimensions.dropmenuh>this.dimensions.docscrolly+this.dimensions.docheight)
		{
			//drop up instead?
			posy=Math.max(posy-this.dimensions.dropmenuh - (menu.orientation=="lr"? -this.dimensions.anchorh : this.dimensions.anchorh), this.dimensions.docscrolly) //position above anchor or window's top edge
		}
		if (this.effects.fade.enabled)
		{
			this.setopacity(menu.dropmenu, 0) //set opacity to 0 so menu appears hidden initially
			if (this.effects.shadow.enabled)
				this.setopacity(menu.shadow, 0) //set opacity to 0 so shadow appears hidden initially
		}
		menu.dropmenu.setcss({left:posx+'px', top:posy+'px', visibility:'visible'})
		if (this.effects.shadow.enabled)
		{
			//menu.shadow.setcss({width: menu.dropmenu.offsetWidth+"px", height:menu.dropmenu.offsetHeight+"px"})
			menu.shadow.setcss({left:posx+anylinkmenu.effects.shadow.depth[0]+'px', top:posy+anylinkmenu.effects.shadow.depth[1]+'px', visibility:'visible'})
		}
		if (this.effects.fade.enabled)
		{
			clearInterval(menu.animatetimer)
			menu.curanimatedegree=0
			menu.starttime=new Date().getTime() //get time just before animation is run
			menu.animatetimer=setInterval(function(){anylinkmenu.revealmenu(menuid)}, 20)
		}
	},

	revealmenu:function(menuid)
	{
		var menu=anylinkmenu.menusmap[menuid]
		var elapsed=new Date().getTime()-menu.starttime //get time animation has run
		if (elapsed<this.effects.fade.duration)
		{
			this.setopacity(menu.dropmenu, menu.curanimatedegree)
			if (this.effects.shadow.enabled)
			this.setopacity(menu.shadow, menu.curanimatedegree*this.effects.shadow.opacity)
		}
		else
		{
			clearInterval(menu.animatetimer)
			this.setopacity(menu.dropmenu, 1)
			menu.dropmenu.style.filter=""
		}
		menu.curanimatedegree=(1-Math.cos((elapsed/this.effects.fade.duration)*Math.PI)) / 2
	},

	setcss:function(param)
	{
		for (prop in param)
		{
			this.style[prop]=param[prop]
		}
	},

	setcssclass: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
	},

	hidemenu:function(menuid)
	{
		var menu=anylinkmenu.menusmap[menuid]
		clearInterval(menu.animatetimer)
		menu.dropmenu.setcss({visibility:'hidden', left:0, top:0})
		menu.shadow.setcss({visibility:'hidden', left:0, top:0})
	},

	getElementsByClass:function(targetclass)
	{
		if (document.querySelectorAll)
			return document.querySelectorAll("."+targetclass)
		else
		{
			var classnameRE=new RegExp("(^|\\s+)"+targetclass+"($|\\s+)", "i") //regular expression to screen for classname
			var pieces=[]
			var alltags=document.all? document.all : document.getElementsByTagName("*")
			for (var i=0; i<alltags.length; i++)
			{
				if (typeof alltags[i].className=="string" && alltags[i].className.search(classnameRE)!=-1)
				pieces[pieces.length]=alltags[i]
			}
			return pieces
		}
	},

	addDiv:function(divid, divclass, inlinestyle)
	{
		var el=document.createElement("div")
		if (divid)
			el.id=divid
		el.className=divclass
		if (inlinestyle!="" && typeof el.style.cssText=="string")
			el.style.cssText=inlinestyle
		else if (inlinestyle!="")
			el.setAttribute('style', inlinestyle)
		document.body.appendChild(el)
		return el
	},

	getmenuHTML:function(menuobj)
	{
		var menucontent=[]
		var frag=""
		for (var i=0; i<menuobj.items.length; i++)
		{
			frag+='<li><a href="' + menuobj.items[i][1] + '" target="' + menuobj.linktarget + '">' + menuobj.items[i][0] + '</a></li>\n'
			if (menuobj.items[i][2]=="efc" || i==menuobj.items.length-1)
			{
				menucontent.push(frag)
				frag=""
			}
		}
		if (typeof menuobj.cols=="undefined")
			return '<ul>\n' + menucontent.join('') + '\n</ul>'
		else
		{
			frag=""
			for (var i=0; i<menucontent.length; i++)
			{
				frag+='<div class="' + menuobj.cols.divclass + '" style="' + menuobj.cols.inlinestyle + '">\n<ul>\n' + menucontent[i] + '</ul>\n</div>\n'
			}
			return frag
		}
	},

	addEvent:function(targetarr, functionref, tasktype)
	{
		if (targetarr.length>0)
		{
			var target=targetarr.shift()
			if (target.addEventListener)
				target.addEventListener(tasktype, functionref, false)
			else if (target.attachEvent)
				target.attachEvent('on'+tasktype, function(){return functionref.call(target, window.event)})
			this.addEvent(targetarr, functionref, tasktype)
		}
	},

	domready:function(functionref)
	{
		//based on code from the jQuery library
		if (dd_domreadycheck)
		{
			functionref()
			return
		}
		// Mozilla, Opera and webkit nightlies currently support this event
		if (document.addEventListener)
		{
			// Use the handy event callback
			document.addEventListener("DOMContentLoaded", function()
			{
				document.removeEventListener("DOMContentLoaded", arguments.callee, false )
				functionref();
				dd_domreadycheck=true
			}, false )
		}
		else if (document.attachEvent)
		{
			// If IE and not an iframe
			// continually check to see if the document is ready
			if ( document.documentElement.doScroll && window == window.top) 
			(
				function()
				{
					if (dd_domreadycheck) 
						return
					try
					{
						// If IE is used, use the trick by Diego Perini
						// http://javascript.nwbox.com/IEContentLoaded/
						document.documentElement.doScroll("left")
					}
					catch(error)
					{
						setTimeout( arguments.callee, 0)
						return;
					}
					//and execute any waiting functions
					functionref();
					dd_domreadycheck=true
				}
			)
			();
		}
		if (document.attachEvent && parent.length>0) //account for page being in IFRAME, in which above doesn't fire in IE
			this.addEvent(window, function(){functionref()}, "load");
	},

	addState:function(anchorobj, state)
	{
		if (anchorobj.getAttribute('data-image'))
		{
			var imgobj=(anchorobj.tagName=="IMG")? anchorobj : anchorobj.getElementsByTagName('img')[0]
			if (imgobj)
			{
				imgobj.src=(state=="add")? anchorobj.getAttribute('data-overimage') : anchorobj.getAttribute('data-image')
			}
		}
		else
			anylinkmenu.setcssclass(anchorobj, "selectedanchor", state)
	},

	addState:function(anchorobj, state)
	{
		if (anchorobj.getAttribute('data-image'))
		{
			var imgobj=(anchorobj.tagName=="IMG")? anchorobj : anchorobj.getElementsByTagName('img')[0]
			if (imgobj)
			{
				imgobj.src=(state=="add")? anchorobj.getAttribute('data-overimage') : anchorobj.getAttribute('data-image')
			}
		}
		else
			anylinkmenu.setcssclass(anchorobj, "selectedanchor", state)
	},

	setupmenu:function(targetclass, anchorobj, pos)
	{
		this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body
		var relattr=anchorobj.getAttribute("rel")
		dropmenuid=relattr.replace(/\[(\w+)\]/, '')
		var dropmenuvar=window[dropmenuid]
		var dropmenu=this.addDiv(null, dropmenuvar.divclass, dropmenuvar.inlinestyle) //create and add main sub menu DIV
		dropmenu.innerHTML=this.getmenuHTML(dropmenuvar)
		var menu=this.menusmap[targetclass+pos]=
		{
			id: targetclass+pos,
			anchorobj: anchorobj,	
			dropmenu: dropmenu,
			revealtype: (relattr.length!=dropmenuid.length && RegExp.$1=="click")? "click" : "mouseover",
			orientation: anchorobj.getAttribute("rev")=="lr"? "lr" : "ud",
			shadow: this.addDiv(null, "anylinkshadow", null) //create and add corresponding shadow
		}
		menu.anchorobj._internalID=targetclass+pos
		menu.anchorobj._isanchor=true
		menu.dropmenu._internalID=targetclass+pos
		menu.shadow._internalID=targetclass+pos
		menu.dropmenu.setcss=this.setcss
		menu.shadow.setcss=this.setcss
		menu.shadow.setcss({width: menu.dropmenu.offsetWidth+"px", height:menu.dropmenu.offsetHeight+"px"})
		this.setopacity(menu.shadow, this.effects.shadow.opacity)
		this.addEvent([menu.anchorobj, menu.dropmenu, menu.shadow], function(e)
		{
			//MOUSEOVER event for anchor, dropmenu, shadow
			var menu=anylinkmenu.menusmap[this._internalID]
			if (this._isanchor && menu.revealtype=="mouseover" && !anylinkmenu.isContained(this, e))
			{
				//event for anchor
				anylinkmenu.showmenu(menu.id)
				anylinkmenu.addState(this, "add")
			}
			else if (typeof this._isanchor=="undefined")
			{
				//event for drop down menu and shadow
				clearTimeout(menu.hidetimer)
			}
		}, "mouseover")
		this.addEvent([menu.anchorobj, menu.dropmenu, menu.shadow], function(e)
		{
			//MOUSEOUT event for anchor, dropmenu, shadow
			if (!anylinkmenu.isContained(this, e))
			{
				var menu=anylinkmenu.menusmap[this._internalID]
				menu.hidetimer=setTimeout(function()
				{
					anylinkmenu.addState(menu.anchorobj, "remove")
					anylinkmenu.hidemenu(menu.id)
				}, anylinkmenu.effects.delayhide)
			}
		}, "mouseout")
		this.addEvent([menu.anchorobj, menu.dropmenu], function(e)
		{
			//CLICK event for anchor, dropmenu
			var menu=anylinkmenu.menusmap[this._internalID]
			if ( this._isanchor && menu.revealtype=="click")
			{
				if (menu.dropmenu.style.visibility=="visible")
					anylinkmenu.hidemenu(menu.id)
				else
				{
					anylinkmenu.addState(this, "add")
					anylinkmenu.showmenu(menu.id)
				}
				if (e.preventDefault)
					e.preventDefault()
				return false
			}
			else
				menu.hidetimer=setTimeout(function(){anylinkmenu.hidemenu(menu.id)}, anylinkmenu.effects.delayhide)
		}, "click")
	},

	init:function(targetclass)
	{
		this.domready(function(){anylinkmenu.trueinit(targetclass)})
	},

	trueinit:function(targetclass)
	{
		var anchors=this.getElementsByClass(targetclass)
		var preloadimages=this.preloadimages
		for (var i=0; i<anchors.length; i++)
		{
			if (anchors[i].getAttribute('data-image'))
			{
				//preload anchor image?
				preloadimages[preloadimages.length]=new Image()
				preloadimages[preloadimages.length-1].src=anchors[i].getAttribute('data-image')
			}
			if (anchors[i].getAttribute('data-overimage'))
			{
				//preload anchor image?
				preloadimages[preloadimages.length]=new Image()
				preloadimages[preloadimages.length-1].src=anchors[i].getAttribute('data-overimage')
			}
			this.setupmenu(targetclass, anchors[i], i)
		}
	}
}