I have added an exclude option to the settings so you can prevent captions being added to elements not required (like a reCaptcha box…). It’s used like this:

$('div.demo').addCaptions({
  'exclude': {
    'alt': [
      /orange/
    ]
  }
});

This would exclude any images that have the word ‘orange’ in the the alt attribute.

I also fixed a minor bug in which the script would look for captions in elements in reverse order (whoops!).

The only other change is making the elements found within the container a selector instead of an element option and a class option.

There is an updated demo here, or you can just download the script here.