/**
 * 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");
					});
				}
			}
			
		}));
	}
	
	$(function(){
		$("img[@src$=png]").pngfix();
	});
	
	
})(jQuery)