var rand = 1

function toon(teller,formaat){ 

document.getElementById('link'+rand).style.borderColor= "#ffffff";
document.getElementById('link'+teller).style.borderColor= "#ff0000";

if(formaat==1){
document.getElementById('venster2').src=plaatje[0].src
document.getElementById('venster2').style.display= "none"
document.getElementById('venster3').src=plaatje[0].src
document.getElementById('venster3').style.display= "none"
document.getElementById('venster1').style.display= "block"
document.getElementById('venster1').src=plaatje[teller].src}

if(formaat==2){  
document.getElementById('venster1').src=plaatje[0].src
document.getElementById('venster1').style.display= "none"
document.getElementById('venster3').src=plaatje[0].src
document.getElementById('venster3').style.display= "none"
document.getElementById('venster2').style.display= "block"
document.getElementById('venster2').src=plaatje[teller].src}
 
if(formaat==3){  
document.getElementById('venster1').src=plaatje[0].src
document.getElementById('venster1').style.display= "none"
document.getElementById('venster2').src=plaatje[0].src
document.getElementById('venster2').style.display= "none"
document.getElementById('venster3').style.display= "block"
document.getElementById('venster3').src=plaatje[teller].src}
 
document.getElementById('message').innerHTML=tekst[teller]
rand=teller}

function next(a,b){
document.getElementById('message').innerHTML=tekst[0]
document.getElementById('venster1').src=plaatje[0].src
document.getElementById('venster2').src=plaatje[0].src
document.getElementById('venster3').src=plaatje[0].src
document.getElementById('venster1').src=leader[0].src
document.getElementById('blok'+a).style.display= "none"
document.getElementById('blok'+b).style.display= "block"
}

function back(a,b){
document.getElementById('message').innerHTML=tekst[0]
document.getElementById('venster1').src=plaatje[0].src
document.getElementById('venster2').src=plaatje[0].src
document.getElementById('venster3').src=plaatje[0].src
document.getElementById('venster1').src=leader[0].src
document.getElementById('blok'+b).style.display= "none"
document.getElementById('blok'+a).style.display= "block"
}