function switchClass(newActiveTabObj, oldActiveTabObj) 
{
  if (newActiveTabObj.className == 'hnavItem')
  {
    newActiveTabObj.className = 'hnavItemOver';
    oldActiveTabObj.className = 'hnavItem';
  } else if (newActiveTabObj.className == 'hnavItemOver') {
    newActiveTabObj.className = 'hnavItem';
    oldActiveTabObj.className = 'hnavItemOver';
  }
}