Detect image load

You can use the .load() event handler, like this:

$("#myImg").load(function() {
  alert('I loaded!');
}).attr('src', 'myImage.jpg');

Be sure to attach it before setting the source, or the event may have fired before you attached a handler to listen for it (e.g. loading from cache).

If that’s not doable (setting the src after binding), be sure to check if it’s loaded and fire it yourself, like this:

$("#myImg").load(function() {
  alert('I loaded!');
}).each(function() {
  if(this.complete) $(this).load();
});