/**
		 * @author Alexander Farkas
		 * v. 1.21
		 */

		(function($) {
		 if(!document.defaultView || !document.defaultView.getComputedStyle){ // IE6-IE8
		 var oldCurCSS = jQuery.curCSS;
		 jQuery.curCSS = function(elem, name, force){
		 if(name === 'background-position'){
		 name = 'backgroundPosition';
		 }
		 if(name !== 'backgroundPosition' || !elem.currentStyle || elem.currentStyle[ name ]){
		 return oldCurCSS.apply(this, arguments);
		 }
		 var style = elem.style;
		 if ( !force && style && style[ name ] ){
		 return style[ name ];
		 }
		 return oldCurCSS(elem, 'backgroundPositionX', force) +' '+ oldCurCSS(elem, 'backgroundPositionY', force);
		 };
		 }

		 var oldAnim = $.fn.animate;
		 $.fn.animate = function(prop){
		 if('background-position' in prop){
			 prop.backgroundPosition = prop['background-position'];
			 delete prop['background-position'];
		 }
		 if('backgroundPosition' in prop){
			 prop.backgroundPosition = '('+ prop.backgroundPosition;
		 }
		 return oldAnim.apply(this, arguments);
		 };

		 function toArray(strg){
			 strg = strg.replace(/left|top/g,'0px');
			 strg = strg.replace(/right|bottom/g,'100%');
			 strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
			 var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
			 return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
		 }

		 $.fx.step. backgroundPosition = function(fx) {
			 if (!fx.bgPosReady) {
				 var start = $.curCSS(fx.elem,'backgroundPosition');

				 if(!start){//FF2 no inline-style fallback
					 start = '0px 0px';
				 }

				 start = toArray(start);

				 fx.start = [start[0],start[2]];

				 var end = toArray(fx.options.curAnim.backgroundPosition);
				 fx.end = [end[0],end[2]];

				 fx.unit = [end[1],end[3]];
				 fx.bgPosReady = true;
			 }
			 //return;
			 var nowPosX = [];
			 nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
			 nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];           
			 fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];

		 };
		})(jQuery);