(function($) {
    $.fn.fancyZoom = function(options) {

        var options = options || {};
        var directory = options && options.directory ? options.directory : '/img/fancyzoom';
        var zooming = false;

        if ($('#zoom').length == 0) {
            var ext = $.browser.msie ? 'gif' : 'png';
            var html = '<div id="zoom" style="display:none;"> \
                  <table id="zoom_table" style="border-collapse:collapse; width:100%; height:100%;"> \
                    <tbody> \
                      <tr> \
                        <td class="tl" style="background:url(' + directory + '/tl.' + ext + ') 0 0 no-repeat; width:20px; height:20px; overflow:hidden;" /> \
                        <td class="tm" style="background:url(' + directory + '/tm.' + ext + ') 0 0 repeat-x; height:20px; overflow:hidden;" /> \
                        <td class="tr" style="background:url(' + directory + '/tr.' + ext + ') 100% 0 no-repeat; width:20px; height:20px; overflow:hidden;" /> \
                      </tr> \
                      <tr> \
                        <td class="ml" style="background:url(' + directory + '/ml.' + ext + ') 0 0 repeat-y; width:20px; overflow:hidden;" /> \
                        <td class="mm" style="background:#fff; vertical-align:top; padding:10px;"> \
                          <div id="zoom_content"> \
                          </div> \
                        </td> \
                        <td class="mr" style="background:url(' + directory + '/mr.' + ext + ') 100% 0 repeat-y;  width:20px; overflow:hidden;" /> \
                      </tr> \
                      <tr> \
                        <td class="bl" style="background:url(' + directory + '/bl.' + ext + ') 0 100% no-repeat; width:20px; height:20px; overflow:hidden;" /> \
                        <td class="bm" style="background:url(' + directory + '/bm.' + ext + ') 0 100% repeat-x; height:20px; overflow:hidden;" /> \
                        <td class="br" style="background:url(' + directory + '/br.' + ext + ') 100% 100% no-repeat; width:20px; height:20px; overflow:hidden;" /> \
                      </tr> \
                    </tbody> \
                  </table> \
                  <a href="#" title="Close" id="zoom_close" style="position:absolute; top:0; left:0;"> \
                    <img src="' + directory + '/closebox.' + ext + '" alt="Close" style="border:none; margin:0; padding:0;" /> \
                  </a> \
                </div>';

            $('body').append(html);

            $('html').click(function(e) { if ($(e.target).parents('#zoom:visible').length == 0) hide(); });
            $(document).keyup(function(event) {
                if (event.keyCode == 27 && $('#zoom:visible').length > 0) hide();
            });

            $('#zoom_close').click(hide);
        }

        var zoom = $('#zoom');
        var zoom_table = $('#zoom_table');
        var zoom_close = $('#zoom_close');
        var zoom_content = $('#zoom_content');
        var middle_row = $('td.ml,td.mm,td.mr');

        this.each(function(i) {
            $($(this).attr('href')).hide();
            $(this).click(show);
        });

        return this;

        function show(e) {
            if (zooming) return false;
            zooming = true;
            var content_div = $($(this).attr('href'));
            var zoom_width = options.width;
            var zoom_height = options.height;
            var href = $(this).attr('href');
            var width = window.innerWidth || (window.document.documentElement.clientWidth || window.document.body.clientWidth);
            var height = window.innerHeight || (window.document.documentElement.clientHeight || window.document.body.clientHeight);
            var x = window.pageXOffset || (window.document.documentElement.scrollLeft || window.document.body.scrollLeft);
            var y = window.pageYOffset || (window.document.documentElement.scrollTop || window.document.body.scrollTop);
            var window_size = { 'width': width, 'height': height, 'x': x, 'y': y }

            var width = (zoom_width || content_div.width()) + 60;
            var height = (zoom_height || content_div.height()) + 60;
            var d = window_size;

            // ensure that newTop is at least 0 so it doesn't hide close button
            var newTop = Math.max((d.height / 2) - (height / 2) + y, 0);
            var newLeft = (d.width / 2) - (width / 2);
            var curTop = e.pageY;
            var curLeft = e.pageX;

            zoom_close.attr('curTop', curTop);
            zoom_close.attr('curLeft', curLeft);
            zoom_close.attr('scaleImg', options.scaleImg ? 'true' : 'false');

            $('#zoom').hide().css({
                position: 'absolute',
                top: curTop + 'px',
                left: curLeft + 'px',
                width: '1px',
                height: '1px'
            });

            fixBackgroundsForIE();
            zoom_close.hide();

            if (options.closeOnClick) {
                $('#zoom').click(hide);
            }

            if ($(this).attr('href').indexOf('http') != -1) {
                var iframe = true;
            }

            if (options.scaleImg) {
                if (iframe == true) {
                    zoom_content.html('<iframe frameborder="0" src="' + href + '" width="100%" height="' + zoom_height + 'px" style="overflow:hidden; width:100%; height:"' + zoom_height + 'px"></iframe>');
                } else {
                    zoom_content.html(content_div.html());
                }
                $('#zoom_content img').css('width', '100%');
            } else {
                zoom_content.html('');
            }

            $('#zoom').animate({
                top: newTop + 'px',
                left: newLeft + 'px',
                opacity: "show",
                width: width,
                height: height
            }, 500, null, function() {
                if (options.scaleImg != true) {
                    if (iframe == true) {
                        zoom_content.html('<iframe frameborder="0" src="' + href + '" height="' + zoom_height + 'px" width="100%" style="overflow:hidden; width:100%; height:"' + zoom_height + 'px"></iframe>');
                    } else {
                        zoom_content.html(content_div.html());
                    }
                }
                unfixBackgroundsForIE();
                zoom_close.show();
                zooming = false;
            })
            return false;
        }

        function hide() {
            if (zooming) return false;
            zooming = true;
            $('#zoom').unbind('click');
            fixBackgroundsForIE();
            if (zoom_close.attr('scaleImg') != 'true') {
                zoom_content.html('');
            }
            zoom_close.hide();
            $('#zoom').animate({
                top: zoom_close.attr('curTop') + 'px',
                left: zoom_close.attr('curLeft') + 'px',
                opacity: "hide",
                width: '1px',
                height: '1px'
            }, 500, null, function() {
                if (zoom_close.attr('scaleImg') == 'true') {
                    zoom_content.html('');
                }
                unfixBackgroundsForIE();
                zooming = false;
            });
            return false;
        }

        function switchBackgroundImagesTo(to) {
            $('#zoom_table td').each(function(i) {
                var bg = $(this).css('background-image').replace(/\.(png|gif|none)\"\)$/, '.' + to + '")');
                $(this).css('background-image', bg);
            });
            var close_img = zoom_close.children('img');
            var new_img = close_img.attr('src').replace(/\.(png|gif|none)$/, '.' + to);
            close_img.attr('src', new_img);
        }

        function fixBackgroundsForIE() {
            if ($.browser.msie && parseFloat($.browser.version) >= 7) {
                switchBackgroundImagesTo('gif');
            }
        }

        function unfixBackgroundsForIE() {
            if ($.browser.msie && $.browser.version >= 7) {
                switchBackgroundImagesTo('png');
            }
        }
    }
})(jQuery);