(function($) {
    $.fn.imagezoom = function(options) {
        var settings = {
            xzoom: 240,
            yzoom: 240,
            offset: 10,
            position: "BTR",
            preload: 1
        };
        if (options) {
            $.extend(settings, options);
        }
        var noalt = '';
        var self = this;
        $(this).bind("mouseenter", function(ev) {
            var imageLeft = $(this).offset().left;
            var imageTop = $(this).offset().top;
            var imageWidth = $(this).get(0).offsetWidth;
            var imageHeight = $(this).get(0).offsetHeight;
            var boxLeft = $(this).parent().offset().left;
            var boxTop = $(this).parent().offset().top;
            var boxWidth = $(this).parent().width();
            var boxHeight = $(this).parent().height();
            noalt = $(this).attr("alt");
            var bigimage = $(this).attr("rel");
            $(this).attr("alt", '');
            if ($("div.zoomDiv").get().length == 0) {
                $(document.body).append("<div class='zoomDiv'><img class='bigimg' src='" + bigimage + "'/></div><div class='zoomMask'>&nbsp;</div>");
            }
            if (settings.position == "BTR") {
                if (boxLeft + boxWidth + settings.offset + settings.xzoom > screen.width) {
                    leftpos = boxLeft - settings.offset - settings.xzoom;
                } else {
                    leftpos = boxLeft + boxWidth + settings.offset;
                }
            } else {
                leftpos = imageLeft - settings.xzoom - settings.offset;
                if (leftpos < 0) {
                    leftpos = imageLeft + imageWidth + settings.offset;
                }
            }
            $("div.zoomDiv").css({
                top: boxTop,
                left: leftpos
            });
            $("div.zoomDiv").width(settings.xzoom);
            $("div.zoomDiv").height(settings.yzoom);
            $("div.zoomDiv").show();
            $(this).css('cursor', 'crosshair');
            $(document.body).mousemove(function(e) {
                mouse = new MouseEvent(e);
                if (mouse.x < imageLeft || mouse.x > imageLeft + imageWidth || mouse.y < imageTop || mouse.y > imageTop + imageHeight) {
                    mouseOutImage();
                    return;
                }
                var bigwidth = $(".bigimg").get(0).offsetWidth;
                var bigheight = $(".bigimg").get(0).offsetHeight;
                var scaley = 'x';
                var scalex = 'y';
                if (isNaN(scalex) | isNaN(scaley)) {
                    var scalex = (bigwidth / imageWidth);
                    var scaley = (bigheight / imageHeight);
                    //$("div.zoomMask").width((settings.xzoom) / scalex);
                    //$("div.zoomMask").height((settings.yzoom) / scaley);
                    $("div.zoomMask").width(80);
                    $("div.zoomMask").height(80);
                    $("div.zoomMask").css('visibility', 'visible');
                }
                xpos = mouse.x - $("div.zoomMask").width() / 2;
                ypos = mouse.y - $("div.zoomMask").height() / 2;
                xposs = mouse.x - $("div.zoomMask").width() / 2 - imageLeft;
                yposs = mouse.y - $("div.zoomMask").height() / 2 - imageTop;
                xpos = (mouse.x - $("div.zoomMask").width() / 2 < imageLeft) ? imageLeft : (mouse.x + $("div.zoomMask").width() / 2 > imageWidth + imageLeft) ? (imageWidth + imageLeft - $("div.zoomMask").width()) : xpos;
                ypos = (mouse.y - $("div.zoomMask").height() / 2 < imageTop) ? imageTop : (mouse.y + $("div.zoomMask").height() / 2 > imageHeight + imageTop) ? (imageHeight + imageTop - $("div.zoomMask").height()) : ypos;
                $("div.zoomMask").css({
                    top: ypos,
                    left: xpos
                });
                $("div.zoomDiv").get(0).scrollLeft = xposs * scalex;
                $("div.zoomDiv").get(0).scrollTop = yposs * scaley;
            });
        });

        function mouseOutImage() {
            $(self).attr("alt", noalt);
            $(document.body).unbind("mousemove");
            $("div.zoomMask").remove();
            $("div.zoomDiv").remove();
        }
        count = 0;
        if (settings.preload) {
            $('body').append("<div style='display:none;' class='jqPreload" + count + "'></div>");
            $(this).each(function() {
                var imagetopreload = $(this).attr("rel");
                var content = jQuery('div.jqPreload' + count + '').html();
                jQuery('div.jqPreload' + count + '').html(content + '<img src=\"' + imagetopreload + '\">');
            });
        }
    }
})(jQuery);

function MouseEvent(e) {
    this.x = e.pageX;
    this.y = e.pageY;
}