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: "imagezoom_images/loading.gif",
        loadDelay: 150,
        duration: 800,
        closeDuration: 500,
        transition: Fx.Transitions.Cubic.easeOut,
        startOpacity: 0.6,
        closeText: 'Close',
        rel: 'imagezoom',
        showCaptionBar: true,
        overlay: false,
        overlayColor: "#000",
        overlayOpacity: .75
    },
    _options || {});
	
	l// console.log(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);
            });
        });
    }
}