Untitled

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
  <head>
    <title></title>
  </head>

  <body>
    <textarea id="input_field" cols="9" rows="2"></textarea>

    <pre id="result">
    </pre>

    <script>
      function wordwrap() {
        var pre      = document.getElementById("result");
        var textarea = document.getElementById("input_field");

        if (!textarea.value || textarea.value == '') {
          pre.innerHTML = '';
        } else {
           var regex = '.{1,' + textarea.cols + '}(\\s|$)' + '|.{' + textarea.cols + '}|.+$';
           pre.innerHTML = textarea.value.match( RegExp(regex, 'g') ).join( '\n' );
        }
      }

      setInterval("wordwrap()", 100);
    </script>
  </body>
</html>