test.php

$script = " 
   <script type=\"text/javascript\">
      (function() {
        var id = '$id';
        var augment_id = id+'_messages';
        var url = '$splitter_url';

        var callUpdateTimeout = null;

        var updateFunction = function() {
          if (callUpdateTimeout != null)
            clearTimeout(callUpdateTimeout);
          callUpdateTimeout = setTimeout(callUpdateFunction, 500);
        };

        var callUpdateFunction = function(messages) {
          alert(''+messages); return;
          var ul = $('<ul></ul>');
          for (var i in messages)
          {
            a.append($('<li>'+messages[i]+'</li>'));
          }
          $('#'+augment_id).html('');
          $('#'+augment_id).append(a);
        };

        var onUpdateFunction = function() {
          var message = $('#'+id).val();
          $.post(url, {message: message}, updateFunction, 'text');
        };

        $('#'+id).keypress(onUpdateFunction);
      })();
    </script>
";