/* http://keith-wood.name/backgroundPos.html
   Background position animation for jQuery v1.0.0.
   Written by Keith Wood (kbwood{at}iinet.com.au) November 2010.
   Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and 
   MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses. 
   Please attribute the author if you use it. */
(function($){var g='bgPos';$.fx.step['backgroundPosition']=$.fx.step['background-position']=function(a){if(!a.set){var b=$(a.elem);var c=b.data(g);b.css('backgroundPosition',c);a.start=parseBackgroundPosition(c);a.end=parseBackgroundPosition(a.options.curAnim['backgroundPosition']||a.options.curAnim['background-position']);for(var i=0;i<a.end.length;i++){if(a.end[i][0]){a.end[i][1]=a.start[i][1]+(a.end[i][0]=='-='?-1:+1)*a.end[i][1]}}a.set=true}$(a.elem).css('background-position',((a.pos*(a.end[0][1]-a.start[0][1])+a.start[0][1])+a.end[0][2])+' '+((a.pos*(a.end[1][1]-a.start[1][1])+a.start[1][1])+a.end[1][2]))};function parseBackgroundPosition(c){var d={center:'50%',left:'0%',right:'100%',top:'0%',bottom:'100%'};var e=c.split(/ /);var f=function(a){var b=(d[e[a]]||e[a]||'50%').match(/^([+-]=)?([+-]?\d+(\.\d*)?)(.*)$/);e[a]=[b[1],parseFloat(b[2]),b[4]||'px']};if(e.length==1&&$.inArray(e[0],['top','bottom'])>-1){e[1]=e[0];e[0]='50%'}f(0);f(1);return e}$.fn.animate=function(e){return function(a,b,c,d){if(a['backgroundPosition']||a['background-position']){$(this).data(g,this.css('backgroundPosition'))}return e.apply($(this),[a,b,c,d])}}($.fn.animate)})(jQuery);