/**

* jQuery (PNG Fix) v1.2

* Microsoft Internet Explorer 24bit PNG Fix

*

* The MIT License

* 

* Copyright (c) 2007 Paul Campbell (pauljamescampbell.co.uk)

* 

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

* 

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

* 

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*

* @param       Object

* @return      Array

*/
(function($) {

    $.fn.pngfix = function(options) {

        // Review the Microsoft IE developer library for AlphaImageLoader reference 
        // http://msdn2.microsoft.com/en-us/library/ms532969(VS.85).aspx

        // ECMA scope fix
        var elements = this;
        var settings = $.extend({
            imageFixSrc: false,
            sizingMethod: false
        }, options);

        if (!$.browser.msie || ($.browser.msie && $.browser.version >= 7)) {
            return (elements);
        }

        function setFilter(el, path, mode) {
            var fs = el.attr("filters");
            var alpha = "DXImageTransform.Microsoft.AlphaImageLoader";
            if (fs[alpha]) {
                fs[alpha].enabled = true;
                fs[alpha].src = path;
                fs[alpha].sizingMethod = mode;
            } else {
                el.css("filter", 'progid:' + alpha + '(enabled="true", sizingMethod="' + mode + '", src="' + path + '")');
            }
        }

        function setDOMElementWidth(el) {
            if (el.css("width") == "auto" & el.css("height") == "auto") {
                el.css("width", el.attr("offsetWidth") + "px");
            }
        }

        return (
            elements.each(function() {

                // Scope
                var el = $(this);

                if (el.attr("tagName").toUpperCase() == "IMG" && (/\.png/i).test(el.attr("src"))) {
                    if (!settings.imageFixSrc) {

                        // Wrap the <img> in a <span> then apply style/filters, 
                        // removing the <img> tag from the final render 
                        el.wrap("<span></span>");
                        var par = el.parent();
                        par.css({
                            height: el.height(),
                            width: el.width(),
                            display: "inline-block"
                        });
                        setFilter(par, el.attr("src"), "scale");
                        el.remove();
                    } else if ((/\.gif/i).test(settings.imageFixSrc)) {

                        // Replace the current image with a transparent GIF
                        // and apply the filter to the background of the 
                        // <img> tag (not the preferred route)
                        setDOMElementWidth(el);
                        setFilter(el, el.attr("src"), "image");
                        el.attr("src", settings.imageFixSrc);
                    }

                } else {
                    var bg = new String(el.css("backgroundImage"));
                    var matches = bg.match(/^url\("(.*)"\)$/);
                    if (matches && matches.length) {

                        // Elements with a PNG as a backgroundImage have the
                        // filter applied with a sizing method relevant to the 
                        // background repeat type
                        setDOMElementWidth(el);
                        el.css("backgroundImage", "none");

                        // Restrict scaling methods to valid MSDN defintions (or one custom)
                        var sc = "crop";
                        if (settings.sizingMethod) {
                            sc = settings.sizingMethod;
                        }
                        setFilter(el, matches[1], sc);

                        // Fix IE peek-a-boo bug for internal links
                        // within that DOM element
                        el.find("a").each(function() {
                            $(this).css("position", "relative");
                        });
                    }
                }

            })
        );
    }

})(jQuery)