function rolloverButton (buttonNo) {
    var rightShadowHandle = document.getElementById('button' + buttonNo + '_right');
    var botRightShadowHandle = document.getElementById('button' + buttonNo + '_bot_right');
    var botShadowHandle = document.getElementById('button' + buttonNo + '_bot');


    rightShadowHandle.style.display = 'none';
    botRightShadowHandle.style.display = 'none';
    botShadowHandle.style.display = 'none';

    return 0;
  }

  function rolloffButton (buttonNo) {
    var rightShadowHandle = document.getElementById('button' + buttonNo + '_right');
    var botRightShadowHandle = document.getElementById('button' + buttonNo + '_bot_right');
    var botShadowHandle = document.getElementById('button' + buttonNo + '_bot');


    rightShadowHandle.style.display = '';
    botRightShadowHandle.style.display = '';
    botShadowHandle.style.display = '';

    return 0;
  }