function setActiveStyleSheet(title) {
  var i, afk;
  for(i=0; (afk = document.getElementsByTagName('link')[i]); i++) {
    if(afk.getAttribute('rel').indexOf('style') != -1 && afk.getAttribute('title')) {
      afk.disabled = true;
      if(afk.getAttribute('title') == title) afk.disabled = false;
    }
  }
}

function stijltitel(){
    if(screen.width<=1024)title='stijl1024';
    if(screen.width>1024 && screen.width<=1280)title='stijl1280';
    if(screen.width>1280)title='stijl1920';
setActiveStyleSheet(title);
}