function showPersonalTab() {
  $('personalSubnav').show();
  $('communitySubnav').hide();
  $('businessSubnav').hide();
  $('personalTab').addClassName('personalTabOn');
  $('communityTab').removeClassName('communityTabOn');
  $('businessTab').removeClassName('businessTabOn');
}

function showBusinessTab() {
  $('businessSubnav').show();
  $('communitySubnav').hide();
  $('personalSubnav').hide();
  $('businessTab').addClassName('businessTabOn');
  $('communityTab').removeClassName('communityTabOn');
  $('personalTab').removeClassName('personalTabOn');
}

function showCommunityTab() {
  $('communitySubnav').show();
  $('businessSubnav').hide();
  $('personalSubnav').hide();
  $('communityTab').addClassName('communityTabOn');
  $('businessTab').removeClassName('businessTabOn');
  $('personalTab').removeClassName('personalTabOn');
}