function startNewsbox(){
    showdiv('vak1','bericht1');	
}

function showdiv(curvak, divnaam) { 
  document.getElementById('bericht1').style.visibility = 'hidden'; 
  document.getElementById('bericht2').style.visibility = 'hidden'; 
  document.getElementById('bericht3').style.visibility = 'hidden'; 
  document.getElementById('vak1').className='vak-normal';
  document.getElementById('vak2').className='vak-normal';
  document.getElementById('vak3').className='vak-normal';
  if (document.getElementById) { // DOM3 = IE5, NS6 
    document.getElementById(divnaam).style.visibility = 'visible'; 
	document.getElementById(curvak).className='vak-active';
  } 
  else 
  { 
    if (document.layers) { // Netscape 4 
      document.divnaam.visibility = 'visible';
    } 

} 
}