//** AnyLink CSS Menu v2.0- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Script Download/ instructions page: http://www.dynamicdrive.com/dynamicindex1/anylinkcss.htm
//** January 19', 2009: Script Creation date

//**May 23rd, 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. anylinkcssmenu.init) can now be called in the HEAD section

//**May 23rd, 10': v2.21: Fixes script not firing in IE when inside a frame page

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

var anylinkcssmenu={

menusmap: {},
preloadimages: [],
effects: {delayhide: 0, 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=anylinkcssmenu.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({left:posx+anylinkcssmenu.effects.shadow.depth[0]+'px', top:posy+anylinkcssmenu.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(){anylinkcssmenu.revealmenu(menuid);}, 20);
	}
},

revealmenu:function(menuid){
	var menu=anylinkcssmenu.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=anylinkcssmenu.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;
	}
},

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
		anylinkcssmenu.setcssclass(anchorobj, "selectedanchor", state);
},


setupmenu:function(targetclass, anchorobj, pos){
	this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body;
	var relattr=anchorobj.getAttribute("rel");
	var dropmenuid=relattr.replace(/\[(\w+)\]/, '');
	var menu=this.menusmap[targetclass+pos]={
		id: targetclass+pos,
		anchorobj: anchorobj,	
		dropmenu: document.getElementById(dropmenuid),
		revealtype: (relattr.length!=dropmenuid.length && RegExp.$1=="click")? "click" : "mouseover",
		orientation: anchorobj.getAttribute("rev")=="lr"? "lr" : "ud",
		shadow: document.createElement("div")
	};
	menu.anchorobj._internalID=targetclass+pos;
	menu.anchorobj._isanchor=true;
	menu.dropmenu._internalID=targetclass+pos;
	menu.shadow._internalID=targetclass+pos;
	menu.shadow.className="anylinkshadow";
	document.body.appendChild(menu.dropmenu); //move drop down div to end of page
	document.body.appendChild(menu.shadow);
	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=anylinkcssmenu.menusmap[this._internalID];
		if (this._isanchor && menu.revealtype=="mouseover" && !anylinkcssmenu.isContained(this, e)){ //event for anchor
			anylinkcssmenu.showmenu(menu.id);
			anylinkcssmenu.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 (!anylinkcssmenu.isContained(this, e)){
			var menu=anylinkcssmenu.menusmap[this._internalID];
			menu.hidetimer=setTimeout(function(){
				anylinkcssmenu.addState(menu.anchorobj, "remove");
				anylinkcssmenu.hidemenu(menu.id);
			}, anylinkcssmenu.effects.delayhide);
		}
	}, "mouseout");
	this.addEvent([menu.anchorobj, menu.dropmenu], function(e){ //CLICK event for anchor, dropmenu
		var menu=anylinkcssmenu.menusmap[this._internalID];
		if ( this._isanchor && menu.revealtype=="click"){
			if (menu.dropmenu.style.visibility=="visible")
				anylinkcssmenu.hidemenu(menu.id);
			else{
				anylinkcssmenu.addState(this, "add");
				anylinkcssmenu.showmenu(menu.id);
			}
			if (e.preventDefault)
				e.preventDefault();
			return false;
		}
		else
			menu.hidetimer=setTimeout(function(){anylinkcssmenu.hidemenu(menu.id);}, anylinkcssmenu.effects.delayhide);
	}, "click");
},

init:function(targetclass){
	this.domready(function(){anylinkcssmenu.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);
	}
}

};