function initImageZoom(_options) {
	var options = $extend({
		rel: 'imagezoom'
	}, _options || {});
	var elements = $$(document.links).filter(function(el) {
		if ((el.rel) && (el.rel.indexOf(options.rel) != -1))
			return true;
		else
			return false;
	});
	for (var i = 0; i < elements.length; i++) {
		var el = elements[i];
		el.addEvent("click", function() {
			this.blur();
			var sEl = this;
			var imgCap = "";
			if (this.getElements("img").length > 0)
				sEl = this.getElements("img")[0];
			if ((sEl.alt) && (sEl.alt != ""))
				imgCap = sEl.alt;
			else if (sEl.title)
				imgCap = sEl.title;
			else if (sEl.parentNode.title)
				imgCap = sEl.parentNode.title;
			var _options = $extend({
				image: this.href,
				caption: imgCap,
				startElement: sEl
			}, options || {});
			_options.image = this.href;
			_options.caption = imgCap;
			var imagezoom = new Imagezoom(_options);
			imagezoom.preloadImage();
			imagezoom.show();
			return false;
		});
	}
}

var Imagezoom = function(_options) {
	var options = $extend({
		image: false,
		caption: "",
		enableCaptions: true,
		startElement: false,
		x: 10,
		y: 10,
		initWidth: 50,
		initHeight: 50,
		draggable: true,
		loadImage: "css/img/loading.gif",
		loadDelay: 150,
		duration: 800,
		closeDuration: 500,
		transition: Fx.Transitions.Cubic.easeOut,
		startOpacity: 0.6,
		closeText: 'Close',
		rel: 'imagezoom',
		showCaptionBar: true,
		overlay: true,
		overlayColor: "#000",
		overlayOpacity: .75
	}, _options || {});

	var box = document.createElement("div");
	var instance = this;

	/* shadow divs */
	var tl = document.createElement("div");
	tl.className = "s s_tl";
	var tr = document.createElement("div");
	tr.className = "s s_tr";
	var bl = document.createElement("div");
	bl.className = "s s_bl";
	var br = document.createElement("div");
	br.className = "s s_br";
	var top = document.createElement("div");
	top.className = "s s_top";
	var bottom = document.createElement("div");
	bottom.className = "s s_bottom";
	var left = document.createElement("div");
	left.className = "s s_left";
	var right = document.createElement("div");
	right.className = "s s_right";

	this.preloadImage = function() {
		if (options.image != false) {
			var img = new Image();
			img.src = options.image;
			img.style.visibility = "hidden";
			img.style.position = "absolute";
			img.style.top = "-9999999999px";
			img.setAttribute("id", "imagezoom-" + options.image);
			$$('body')[0].appendChild(img);
		}
	}

	this.getImage = function() {
		if (($('imagezoom-' + options.image)) && ($('imagezoom-' + options.image).width != "0")) {
			var img = $('imagezoom-' + options.image).clone();
			img.setAttribute("id", "");
			img.style.position = "relative";
			img.style.top = "0px";
			img.style.visibility = "visible";
		} else {
			instance.preloadImage();
			window.setTimeout(function() {
				instance.getImage();
			}, 50);
		}
		return img;
	}

	this.show = function() {
		if (options.image != false) {
			box.style.position = "absolute";
			box.style.overflow = "hidden";
			box.setAttribute("id", "imagezoom-open-" + options.image);

			if (options.startElement != false)
				options.startElement.blur();

			var x = options.x;
			var y = options.y;
			var boxWidth = options.initWidth;
			var boxHeight = options.initHeight;
			if (options.startElement != false) {
				x = options.startElement.getPosition().x;
				y = options.startElement.getPosition().y;
				boxWidth = options.startElement.offsetWidth;
				boxHeight = options.startElement.offsetHeight;
			}
			box.style.left = x + "px";
			box.style.top = y + "px";
			box.style.width = boxWidth + "px";
			box.style.height = boxHeight + "px";

			var fx = new Fx.Morph(box);
			fx.set({opacity: options.startOpacity});

			box.className = "imagezoom";
			$$('body')[0].appendChild(box);
			box.style.cursor = "pointer";
			box.addEvent("click", function() {
				var fx = new Fx.Morph(box, {duration: 200});
				fx.start({opacity: 0}).chain(function() {
					$$('body')[0].removeChild(box);
				});
			});

			this.loadImage();
		}
	}

	this.loadImage = function() {
		if (box.getElements(".loading").length == 0) {
			var loading = new Image();
			loading.src = options.loadImage;
			loading.className = "loading";
			box.appendChild(loading);
		}
		if ($('imagezoom-' + options.image)) {
			var el = $('imagezoom-' + options.image);
			if (el.width != "0") {
				var newEl = new Image();
				newEl.src = options.image;
				window.setTimeout(function() { instance.insertImage(newEl) }, options.loadDelay);
			} else {
				window.setTimeout(function() { instance.loadImage(); }, 50);
			}
		} else {
			instance.preloadImage();
			window.setTimeout(function() { instance.loadImage(); }, 50);
		}
	}

	this.insertImage = function(img) {
		box.removeEvents("click");
		box.style.cursor = "default";
		box.style.overflow = "visible";
		var w = img.width;
		var h = img.height;
		img.style.width = w + "px";
		img.style.height = h + "px";
		img.className = 'image';
		var ptop = (window.getSize().y / 2) + window.getScroll().y - (h/2);
		var pleft = (window.getSize().x / 2) + window.getScroll().x - (w/2);
		var fx = new Fx.Morph(box, {duration: options.duration, transition: options.transition});
		fx.start({
			top: ptop,
			left: pleft,
			width: w,
			height: h,
			opacity: 1
		}).chain(function() {
			if (options.overlay == true) {
				if (!$('imagezoom_overlay')) {
					var overlay = $(document.createElement("div"));
					overlay.setAttribute("id", "imagezoom_overlay");
					overlay.style.backgroundColor = options.overlayColor;
					overlay.setOpacity(0);
					$$('body')[0].appendChild(overlay);
				} else {
					var overlay = $('imagezoom_overlay');
				}
				overlay.style.width = window.getScrollSize().x + "px";
				overlay.style.height = window.getScrollSize().y + "px";
				var overlayfx = new Fx.Morph(overlay, {duration: 600});
				overlayfx.start({
					opacity: options.overlayOpacity
				});
			}
			var close = $(document.createElement("div"));
			close.innerHTML = "<span>" + options.closeText + "</span>";
			close.className = "close";
			close.addEvent("click", function() {
				instance.close(true);
			});
			var loading = box.getElements(".loading");
			if (loading.length > 0)
				box.removeChild(loading[0]);
			var elements = [close, tl, tr, bl, br, top, bottom, left, right, img];
			for (var i = 0; i < elements.length; i++) {
				var elFx = new Fx.Morph(elements[i], {duration: 600});
				elFx.set({opacity: 0});
				box.adopt(elements[i]);
				elFx.start({opacity: 1});
			}
			var caption;
			if ((options.caption != "") && (options.enableCaptions == true)) {
				caption = document.createElement("div");
				caption.className = "caption";
				caption.innerHTML = "<p>" + options.caption + "</p>";
				box.appendChild(caption);
			}
			instance.addSetNavigation();
			if (box.getElements(".caption").length > 0) {
				caption = box.getElements(".caption")[0];
				var cfx = new Fx.Morph(caption, {duration: 200});
				cfx.set({opacity: 0});
				if (options.showCaptionBar == true) {
					caption.className += " visibleCaption";
					var cStartFx = new Fx.Morph(caption, {duration: 600});
					cStartFx.start({
						opacity: 1
					});
				}
				box.addEvent("mouseenter", function() {
					cfx.start({opacity: 1}).chain(function() { caption.className += " visibleCaption"; });
				});
				box.addEvent("mouseleave", function() {
					cfx.start({opacity: 0}).chain(function() { caption.className = caption.className.replace(/visibleCaption/g, ""); });
				});
				close.addEvent("mouseenter", function() {
					cfx.start({opacity: 0}).chain(function() { caption.className = caption.className.replace(/visibleCaption/g, ""); });
				});
				box.getElements(".image")[0].addEvent("click", function() {
					var action = "show";
					if (caption.className.indexOf("visibleCaption") != -1)
						action = "hide";
					if (action == "show")
						cfx.start({opacity: 1}).chain(function() { caption.className += " visibleCaption"; });
					else
						cfx.start({opacity: 0}).chain(function() { caption.className = caption.className.replace(/visibleCaption/g, ""); });
				});
			}
			top.style.width = box.offsetWidth + "px";
			bottom.style.width = box.offsetWidth + "px";
			left.style.height = box.offsetHeight + "px";
			right.style.height = box.offsetHeight + "px";
			if (options.draggable == true)
				var move = new Drag.Move(box, {handle: img});
		});
	}

	this.addSetNavigation = function() {
		var links = $$(document.links).filter(function(link) {
			if ((link.rel) && (link.rel.indexOf(options.rel) != -1))
				return true;
			else
				return false;
		});
		var set = false;
		for (var i = 0; i < links.length; i++) {
			if ((links[i].href.indexOf(options.image) != -1) && (links[i].rel) && (links[i].rel.indexOf(options.rel + '[' != -1))) {
				var rel = links[i].getAttribute("rel");
				set = instance.scanRel("after", options.rel + "[", this.scanRel("before", "]", rel));
			}
		}
		if (set != false) {
			var prevLink = false;
			var nextLink = false;
			var setLinks = new Array();
			for (i = 0; i < links.length; i++) {
				if (links[i].rel.indexOf(options.rel + "[" + set + "]") != -1) {
					setLinks[setLinks.length] = links[i];
				}
			}
			for (i = 0; i < setLinks.length; i++) {
				var link = setLinks[i];
				if ((link.href.indexOf(options.image) != -1) && (link.rel) && (link.rel.indexOf(options.rel != -1))) {
					if (i != 0)
						prevLink = setLinks[i - 1];
					if (i != setLinks.length - 1)
						nextLink = setLinks[i + 1];
				}
			}
			if ((prevLink != false) || (nextLink != false)) {
				if (box.getElements(".caption").length == 0) {
					var caption = document.createElement("div");
					caption.className = "caption";
					box.appendChild(caption);
				} else {
					var caption = box.getElements(".caption")[0];
				}
			}
			if (prevLink != false) {
				var previousButton = $(document.createElement("div"));
				previousButton.className = "previous";
				var prevCap = '';
				if (prevLink.title)
					prevCap = prevLink.title;
				var prevEl = prevLink;
				if (prevLink.getElements("img").length > 0)
					prevEl = prevLink.getElements("img")[0];
				previousButton.addEvent("click", function() {
					var newOptions = $unlink(options);
					var imagezoomPrev = new Imagezoom($extend(newOptions, {
						image: prevLink.href,
						caption: prevCap,
						rel: options.rel,
						startElement: prevEl,
						showCaptionBar: true
					}));
					instance.close();
					imagezoomPrev.show();
				});
				caption.appendChild(previousButton);
			}
			if (nextLink != false) {
				var nextButton = $(document.createElement("div"));
				nextButton.className = "next";
				var nextCap = '';
				if (nextLink.title)
					nextCap = nextLink.title;
				var nextEl = nextLink;
				if (nextLink.getElements("img").length > 0)
					nextEl = nextLink.getElements("img")[0];
				nextButton.addEvent("click", function() {
					var newOptions = $unlink(options);
					var imagezoomNext = new Imagezoom($extend(newOptions, {
						image: nextLink.href,
						caption: nextCap,
						rel: options.rel,
						startElement: nextEl,
						showCaptionBar: true
					}));
					instance.close();
					imagezoomNext.show();
				});
				caption.appendChild(nextButton);
			}
		}
	}

	this.scanRel = function(where, needle, string) {
		var newstring = '';
		if (where == "after") {
			var startpos = string.indexOf(needle) + needle.length;
			var endpos = string.length;
		} else if (where == "before") {
			var startpos = 0;
			var endpos = string.indexOf(needle);
		}
		for (var i = startpos; i < endpos; i++) {
			newstring += string.charAt(i);
		}
		return newstring;
	}

	this.close = function(hideOverlay) {
		var img = box.getElements(".image")[0];
		box.removeChild(img);
		var close = box.getElements(".close")[0];
		box.removeChild(close);
		var caption = box.getElements(".caption");
		if (caption.length > 0)
			box.removeChild(caption[0]);
		var s = box.getElements(".s");
		for (var i = 0; i < s.length; i++)
			box.removeChild(s[i]);
		var x = options.x;
		var y = options.y;
		var boxWidth = options.initWidth;
		var boxHeight = options.initHeight;
		if (options.startElement != false) {
			x = options.startElement.getPosition().x;
			y = options.startElement.getPosition().y;
			boxWidth = options.startElement.offsetWidth;
			boxHeight = options.startElement.offsetHeight;
		}
		if ((hideOverlay == true) && ($('imagezoom_overlay'))) {
			var oFx = new Fx.Morph($('imagezoom_overlay'), {duration: options.closeDuration});
			oFx.start({opacity: 0}).chain(function() {
				$$('body')[0].removeChild($('imagezoom_overlay'));
			});
		}
		var fx = new Fx.Morph(box, {duration: options.closeDuration});
		fx.start({
			left: x,
			top: y,
			width: boxWidth,
			height: boxHeight,
			opacity: options.startOpacity
		}).chain(function() {
			fx.start({
				opacity: 0
			}).chain(function() {
				$$('body')[0].removeChild(box);
			});
		});
	}
}