(function(c){function d(a){a=a.replace(/left|top/g,"0px");a=a.replace(/right|bottom/g,"100%");a=a.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");var b=a.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);return[parseFloat(b[1],10),b[2],parseFloat(b[3],10),b[4]]}c.extend(c.fx.step,{backgroundPosition:function(a){if(!a.bgPosReady){var g=c.curCSS(a.elem,"backgroundPosition");if(!g){return false}g=d(g);a.start=[g[0],g[2]];var b=d(a.end);a.end=[b[0],b[2]];a.unit=[b[1],b[3]];a.bgPosReady=true}var h=[];h[0]=((a.end[0]-a.start[0])*a.pos)+a.start[0]+a.unit[0];h[1]=((a.end[1]-a.start[1])*a.pos)+a.start[1]+a.unit[1];a.elem.style.backgroundPosition=h[0]+" "+h[1]}})})(jQuery);