Can I convert all files with jquery file upload to jpg?
<p>I'm using the <a href="http://blueimp.github.com/jQuery-File-Upload/" rel="nofollow">jquery file upload</a> script and it's working really well so far.  The last obstacle I have is I only want to use <strong>jpg</strong> images for my website but allow users the option of uploading gif, png, or jpg.  </p>

<p>I'm assuming I need to alter or add some additional methods to the upload.class.php file to accomplish this.</p>

<p>Has anyone done this before and if so is this the correct file to modify?</p>
