// $.imagesLoaded() |  mit license  |  paul irish  |  2010
$.fn.imagesLoaded = function(callback){
  var elems = this.filter('img'),
	  len   = elems.length,
	  blank = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
	  
  elems.bind('load',function(){
	  if (--len <= 0 && this.src !== blank){ callback.call(elems,this); }
  }).each(function(){
	 if (this.complete || this.complete === undefined){
		var src = this.src;
		this.src = blank;
		this.src = src;
	 }  
  }); 

  return this;

};


// Background-Poisiton Animation Extension  |  Alexander Farkas  |  v1.21
(function($) {
	
	if(!document.defaultView || !document.defaultView.getComputedStyle){ // IE6-IE8

		var oldCurCSS = jQuery.curCSS;

		jQuery.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) { start = '0px 0px'; } 

			start    = toArray(start); 
			fx.start = [start[0],start[2]]; 

			var end  = toArray(fx.options.curAnim.backgroundPosition);
			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);