/**
 * @author Alexander Farkas
 * v. 1.02
 */
(function($) {
    $.extend($.fx.step,{
        backgroundPosition: function(fx) {
            if (fx.state === 0 && typeof fx.end == 'string') {
                var start = (typeof $.curCSS(fx.elem,'backgroundPosition') != 'undefined') ? $.curCSS(fx.elem,'backgroundPosition') : $.curCSS(fx.elem,'background-position-x') + ' ' + $.curCSS(fx.elem,'background-position-y');                
                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]];
            }
            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];

            function toArray(strg){
                if(strg!='undefined'){
                    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]];
                }
            }
        }
    });
})(jQuery);