function viewFPTabs(aTabs){
  var d = document.getElementById('tabs_fp_' + aTabs);
  d.className='tabs_on';

  var d = document.getElementById('tabs_fp_' + aTabs + '_panel');
  d.style.display='block';
}

function hideFPTabs(aTabs){
  var d = document.getElementById('tabs_fp_' + aTabs);
  d.className='tabs_off';

  var d = document.getElementById('tabs_fp_' + aTabs + '_panel');
  d.style.display='none';
}

function switchFPTabs(aViewTabs){
  switch (aViewTabs) {
    case 'preview':
      viewFPTabs('preview');
      hideFPTabs('configuration');
      hideFPTabs('drm');
    break;
    case 'configuration':
      viewFPTabs('configuration');
      hideFPTabs('preview');
      hideFPTabs('drm');
    break;
    case 'drm':
      viewFPTabs('drm');
      hideFPTabs('configuration');
      hideFPTabs('preview');
    break;
  }
}