gistfile1.js

// The CSS property backgroundPosition does not exist in the accessible DOM properties within IE 8. 
// this css() method duck punch retifies that issue
// see also: http://paulirish.com/2010/duck-punching-with-jquery/

// usage: $(elem).css('backgroundPosition');
// ticket: http://dev.jquery.com/ticket/5749

(function($){  
    
    var _css = $.fn.css; 
  
    $.fn.css = function(name,val){
     
     if (!val && /^background(-p|P)osition$/.test(name)){
         var value = _css.apply(this,arguments);
         return  value !== undefined ? value : 
                [_css.call(this,"backgroundPositionX"), "px ",
                _css.call(this,"backgroundPositionY"), "px"].join(""); 
     } else {
         return _css.apply(this,arguments);
     }  
    }
    
})(jQuery);