function changeBk( id, state ) {

  var onColor = "#666666";
  var offColor = "#333333";

  if ( state == "on" ) {

    color = onColor;

  } else if ( state == "off" ) {

    color = offColor;

  }

  document.getElementById(id).style.backgroundColor = color;

}

function clickLink( id ) {

  document.location.href = document.getElementById( id + "link" ).href;

}