title: submit button grayed out
body: <p>I have a submit button on a form that is quite important.  I do not want users clicking it more than once.  Is there a way to make it unclickable or grayed out after they click it.  (maybe an on click event?).  My simple code is below</p>
  
  <pre><code>&lt;form method='POST'  action='index.php'&gt;
  &lt;input type='text' name='text' id='text'&gt;
  &lt;input type ='submit' value='submit' name='submit'&gt;
  &lt;/form&gt;
  </code></pre>