// $('img.photo',this).imagesLoaded(myFunction)
// execute a callback when all images have loaded.
// needed because .load() doesn't work on cached images
 
// mit license. paul irish. 2010.
 
// callback function is passed the last image to load
//   as an argument, and the collection as `this`
 
$.fn.imagesLoaded = function(callback){
  var elems = this.filter('img'),
      len   = elems.length;
      
  elems.bind('load',function(){
      if (--len <= 0){ callback.call(elems,this); }
  }).each(function(){
      // cached images don't fire load sometimes, so we reset src.
      if (this.complete || this.complete === undefined){ this.src = this.src; }      
  }); 
}