title: jQuery Validation plugin messages on file items don't clear after picking a legal file?
body: <p>I'm using the <a href="http://jqueryvalidation.org/" rel="nofollow">jQuery Validation plugin</a> to validate some forms.  I have a file field in the form, for which I have an entry in the <code>rules</code> clause something like <code>the_file: { required: true, accept: 'txt|doc' }</code>. This successfully detects the absence of a selected file or the selection of a file with the wrong extension, but the error message is not removed after I pick a file with the proper extension.  I've experimented with <code>onfocusout</code> clauses, but with no luck.  FWIW, the other fields in the form are behaving properly (e.g., the message on a text field disappears after I enter a few characters into the field).  Is there a way to get the file field's message to clear after selecting a legal file?  Thanks!</p>