/**


 * @author Alexander Farkas


 * v. 1.22


 */


(function($) {


	if(!document.defaultView || !document.defaultView.getComputedStyle){ // IE6-IE8


		var oldCurCSS = $.curCSS;


		$.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.end);


			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);