/*
 * jQuery pngfix plugin
 * Version 1.2  (20/05/2007)
 * @requires jQuery v1.1.1
 *
 * Examples at: http://khurshid.com/jquery/iepnghack/
 * Copyright (c) 2007 Khurshid 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
  *
  * $('img[@src$=.png], #panel').pngfix();
  *
  * @apply hack to all png images and #panel which icluded png img in its css
  *
  * @name pngfix
  * @type jQuery
  * @cat Plugins/Image
  * @return jQuery
  * @author jQuery Community
  */
 
(function($) {
  /**
   * helper variables and function
   */
  var hack = {
    ltie7 : $.browser.msie && /MSIE\s(5\.5|6\.)/.test(navigator.userAgent),
    pixel : 'js/img/0.gif',
    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]').iepnghack();
   * @desc apply hack to all images with png extensions
   *
   * $('#panel, img[@src$=.png]').iepnghack();
   * @desc apply hack to element #panel and all images with png extensions
   *
   * @name iepnghack
   * @type jQuery
   * @cat Plugins/iepnghack
   */
  $.fn.pngfix = hack.ltie7 ? function() {
      return this.each(function() {
      var $$ = $(this);
      if ($$.is('img')) { /* hack image tags present in dom */
        $$.css({filter:hack.filter($$.attr('src')), width:$$.width(), height:$$.height()})
          .attr({src:hack.pixel})
          .positionFix();
      } else { /* hack png css properties present inside css */
        var image = $$.css('backgroundImage');
        if (image.match(/^url\(["'](.*\.png)["']\)$/i)) {
          image = RegExp.$1;
          $$.css({backgroundImage:'none', filter:hack.filter(image)})
            .positionFix();
        }
      }
    });
  } : function() { return this; };
  /**
   * Removes any png hack that may have been applied previously
   *
   * $('img[@src$=.png]').pngunfix();
   * @desc revert hack on all images with png extensions
   *
   * $('#panel, img[@src$=.png]').iepnghack();
   * @desc revert hack on element #panel and all images with png extensions
   *
   * @name pngunfix
   * @type jQuery
   * @cat Plugins/iepnghack
   */
  $.fn.pngunfix = hack.ltie7 ? function() {
      return this.each(function() {
      var $$ = $(this);
      var src = $$.css('filter');
      if (src.match(/src=["'](.*\.png)["']/i)) { /* get img source from filter */
        src = RegExp.$1;
        if ($$.is('img')) {
          $$.attr({src:src}).css({filter:''});
        } else {
          $$.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);