/*
 * jQuery ifixpng plugin
 * (previously known as pngfix)
 * Version 2.1  (23/04/2008)
 * @requires jQuery v1.1.3 or above
 *
 * Examples at: http://jquery.khurshid.com
 * Copyright (c) 2007 Kush M.
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 */
 
 /**
  *
  * @example
  *
  * optional if location of pixel.gif if different to default which is images/pixel.gif
  * $.ifixpng('media/pixel.gif');
  *
  * $('img[@src$=.png], #panel').ifixpng();
  *
  * @apply hack to all png images and #panel which icluded png img in its css
  *
  * @name ifixpng
  * @type jQuery
  * @cat Plugins/Image
  * @return jQuery
  * @author jQuery Community
  */
 
(function($) {

/**
 * helper variables and function
 */
$.ifixpng = function(customPixel) {
$.ifixpng.pixel = customPixel;
};

$.ifixpng.getPixel = function() {
return $.ifixpng.pixel || '/img/pixel.gif';
};

var hack = {
ltie7  : $.browser.msie && $.browser.version < 7,
filter : function(src) {
return "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true,sizingMethod=crop,src='"+src+"')";
}
};

/**
 * Applies ie png hack to selected dom elements
 *
 * $('img[@src$=.png]').ifixpng();
* @desc apply hack to all images with png extensions
 *
 * $('#panel, img[@src$=.png]').ifixpng();
* @desc apply hack to element #panel and all images with png extensions
 *
 * @name ifixpng
 */
 
$.fn.ifixpng = hack.ltie7 ? function() {
     return this.each(function() {
var $$ = $(this);
// in case rewriting urls
var base = $('base').attr('href');
if (base) {
// remove anything after the last '/'
base = base.replace(/\/[^\/]+$/,'/');
}
if ($$.is('img') || $$.is('input')) { // hack image tags present in dom
if ($$.attr('src')) {
if ($$.attr('src').match(/.*\.png([?].*)?$/i)) { // make sure it is png image
// use source tag value if set 
var source = (base && $$.attr('src').search(/^(\/|http:)/i)) ? base + $$.attr('src') : $$.attr('src');
// apply filter
$$.css({filter:hack.filter(source), width:$$.width(), height:$$.height()})
  .attr({src:$.ifixpng.getPixel()})
  .positionFix();
}
}
} else { // hack png css properties present inside css
var image = $$.css('backgroundImage');
if (image.match(/^url\(["']?(.*\.png([?].*)?)["']?\)$/i)) {
image = RegExp.$1;
image = (base && image.substring(0,1)!='/') ? base + image : image;
$$.css({backgroundImage:'none', filter:hack.filter(image)})
  .children().children().positionFix();
}
}
});
} : function() { return this; };

/**
 * Removes any png hack that may have been applied previously
 *
 * $('img[@src$=.png]').iunfixpng();
* @desc revert hack on all images with png extensions
 *
 * $('#panel, img[@src$=.png]').iunfixpng();
* @desc revert hack on element #panel and all images with png extensions
 *
 * @name iunfixpng
 */
 
$.fn.iunfixpng = hack.ltie7 ? function() {
     return this.each(function() {
var $$ = $(this);
var src = $$.css('filter');
if (src.match(/src=["']?(.*\.png([?].*)?)["']?/i)) { // get img source from filter
src = RegExp.$1;
if ($$.is('img') || $$.is('input')) {
$$.attr({src:src}).css({filter:''});
} else {
$$.css({filter:'', background:'url('+src+')'});
}
}
});
} : function() { return this; };

/**
 * positions selected item relatively
 */
 
$.fn.positionFix = function() {
return this.each(function() {
var $$ = $(this);
var position = $$.css('position');
if (position != 'absolute' && position != 'relative') {
$$.css({position:'relative'});
}
});
};

})(jQuery);