// set up an array of features (ids).
var feats = new Array('intro','tuning','klangmassagen','lydbadet','toning');

function switchfeat(nam) {
  var count = 0;
  for (i=0;i<feats.length;i++){
    var nt = document.getElementById(feats[i]);
    if (feats[i]==nam) {
      nt.setAttribute('class','set');
      nt.setAttribute('className','set');
      //nt.style.display = 'block';
    }
    else {
      nt.setAttribute('class','hidden');
      nt.setAttribute('className','hidden');
      //nt.style.display = 'hidden';
    }
    count++;
  }
  return;
}