function switchImage(toShow) {
  var images = document.getElementsByName('slideshowLarge');
  for (var i = 0; i < images.length; i++) {
    images[i].style.display = 'none';
  }
  document.getElementById(toShow).style.display = 'block';
}

function showCv(toShow)
{
  document.getElementById('cv_alex').style.display = 'none';
  document.getElementById('cv_tim').style.display = 'none';

  document.getElementById(toShow).style.display = 'block';

}