function toonVerberg(antwoord){
  e=document.getElementById(antwoord)
  toon=e.style.display
  if (toon=='none' || toon=='' ) e.style.display='block'
  else e.style.display='none'
}

function setStijlblad(title) {
  for(i=0; (elem = document.getElementsByTagName("link")[i]); i++) {
    if(elem.getAttribute("rel").indexOf("style") != -1 && elem.getAttribute("title")) {
      elem.disabled = true;
      if(elem.getAttribute("title") == title) elem.disabled = false;
    }
  }
}