static S html_chessBoard(S position) {
  ret [[<link rel="stylesheet" href="http://tinybrain.de:8080/chessboard-js/css/chessboard-0.3.0.css" />]]
    + loadJQuery()
    + [[<script src="http://tinybrain.de:8080/chessboard-js/js/chessboard-0.3.0.js"></script>]]
    + [[<div id="board1" style="width: 400px"></div>]]
    + hjavascript([[
  $(document).ready(function() {
    var cfg = {
      pieceTheme: 'http://tinybrain.de:8080/chessboard-js/img/chesspieces/wikipedia/{piece}.png',
      position: ]] + jsQuote(position) + [[
    };
    var board = ChessBoard('board1', cfg);
  });]]);
}