title: Combining URL text box with FileUpload control
body: <p>I'm developing a web app which allows users to upload images.  Instead of forcing them to first download an image I also want to allow them to provide a URL of the image elsewhere on the web.</p>
  
  <p>I've got the code to do this, my question is <strong>how can I combine these into one text box</strong> that will allow the user to enter <em>either</em> the location of the image on their hard drive <em>or</em> the location of the image on the web.</p>
  
  <p>I'm aware of the ASP File Upload control - but how could I leverage it to do this?</p>