function ChangeBG(CellName)
{
  identity=document.getElementById(CellName);
  identity.className='MenuItemBoxOver';
}

function RevertBG(CellName)
{
  identity=document.getElementById(CellName);
  identity.className='MenuItemBox';
}

function ChangeTBG(CellName)
{
  identity=document.getElementById(CellName);
  identity.className='TrainingMenuItemBoxOver';
}

function RevertTBG(CellName)
{
  identity=document.getElementById(CellName);
  identity.className='TrainingMenuItemBox';
}