title: Can I call a Javascript bookmarklet over just an image in browser window. e.g.:blah.com/blah.jpg?
body: <p>If I'm at a url... say <a href="http://i.imgur.com/JcxmE.jpg" rel="nofollow">http://i.imgur.com/JcxmE.jpg</a> where it is just the image file, how can I make a window/div appear over the image when the bookmarklet is called?
  Instapaper does this.
  So far my bookmarklet loads an external javascript file, which in turn creates a div and appends it to the body.
  This doesn't work when it is just an image.
  Ideas?
  Thank you!</p>