owEnable = ! rainbowEnable;
  if (rainbowEnable) {
    connection.send("R");
    document.getElementById('rainbow').style.backgroundColor = '#00878F';
    document.getElementById('r').className = 'disabled';
    document.getElementById('g').className = 'disabled';
    document.getElementById('b').className = 'disabled';
    document.getElementById('r').disabled = true;
    document.getElementById('g').disabled = true;
    document.getElementById('b').disabled = true;
  } else {
    connection.send("N");
   