<script>
function unwell()
{
  window.location = '%u/eval/' + encodeURIComponent(document.forms[0].code.value);
}
</script>
<form action='javascript:unwell()'>
  <p>Code to evaluate: <input name='code'></p>
</form>
<p>Press enter or click <a href='javascript:unwell()'>evaluate</a> to
   run your code.</p>
