/**
 * @author Alexander Farkas
 * v. 1.02
 */
(function($) {
	$.extend($.fx.step,{
  backgroundPosition: function(fx) {
   if (fx.state === 0 && typeof fx.end == 'string') {
    var start = $.curCSS(fx.elem,'backgroundPosition');
    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){
    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);

jQuery.fn.extend({
 findPos : function()
 {
  obj = $(this).get(0);
  var curtop = obj.offsetTop || 0;
  while (obj = obj.offsetParent) 
  {
   curtop += obj.offsetTop
  }
  return curtop;
 }
});