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    cell.parentNode.cells[cell.cellIndex + 1].id = "current_cell";
  }
}

function fill_cell_from_key(event) {
  $('current_cell').innerHTML = event.keyName; 
  Event.stop(event);
}


function say(msg) {
  return function() {alert(msg)};
}


var keymap;
document.observe('dom:loaded', function() {
  var C_X_map = {A: say('A'),
                 B: say('B'),
                 R: GvaScript.KeyMap.Prefix({K: say('Ctrl-X R K'),
                                          O: say('Ctrl-X R O')})};

  var rules   = {UP:     Up, 
                 DOWN:   Down, 
                 LEFT:   Left, 
                 RIGHT:  Right, 
                 RETURN: Red,
                 27:     say('no escape from here'),

                 C_X: GvaScript.KeyMap.Prefix(C_X_map),

                 REGEX: [ ["",   /[0-9]/,             fill_cell_from_key],
                          ["C_", /^[aeiou]$/i,        fill_cell_from_key],
                          [null, "RETURN|TAB|ESCAPE", add_msg           ] ]};

  keymap = new GvaScript.KeyMap(rules);

  keymap.observe("keydown", 'table');