title: Disable/enable entire form's submit with jquery
body: <p>When my form doesn't validate, I want to disable the form's submit function.
  I can do this by disabling the submit button, but this would leave the enter key unchecked.<br>
  I can set the .submit(return false); but then I can't re-enable it again later.</p>
  
  <p>Any suggestions?</p>