var curr_teaser_div = '0';
 // wanneer op de home, teaser starten
var timeoutid = setTimeout("show_teaser(-1)",8000); 
  
function show_teaser(div) {
  document.getElementById('teaser'+curr_teaser_div).style.display = 'none';
              document.getElementById('tln_'+curr_teaser_div).className = 'tlink';

  // Zet vars
  if (div==-1) { // timer starten
    curr_teaser_div++;
    if (curr_teaser_div==4) curr_teaser_div=0; // bij einde loop weer terug gaan naar 0 
    timeoutid = setTimeout("show_teaser(-1)",8000) // timer setten
  } else {
    curr_teaser_div = div;
    if (timeoutid) clearTimeout(timeoutid); // timer stop zitten
  }	

  // Zet nieuwe aan	
              document.getElementById('tln_'+curr_teaser_div).className = 'tlink tlink_s';

  document.getElementById('tefirst').className = 'corner tfirst_s';
  if (curr_teaser_div == 0){
   document.getElementById('tefirst').className = 'corner tfirst';
  }
  document.getElementById('teaser'+curr_teaser_div).style.display = 'block';
}