title: jquery catch a first keypress only?
body: <p>I have this code:</p>
  
  <pre><code> $j("#regfname").keypress(function () {
      alert('Handler for .keypress() called.');
  });
  </code></pre>
  
  <p>and want to execute only once... or only for the first keypress ..what's the most optimal way to do it? </p>