function showEvent(layer_ref,count) {
  var themeDir = '/sites/all/themes/nzhistory';
  for (i = 1; i < count; i++) {
    var thisDiv = 'tih-event-' + i;
    var thisBtn = 'tih-tab-' + i;
    var divEl = document.getElementById(thisDiv);
    if (i == layer_ref) {
      divEl.style.display = "block";
      divEl.style.visibility = "visible";
      document.images[thisBtn].src = themeDir + "/theme-gfx/timeline-tab-on.png";
    }
    else {
      divEl.style.display = "none";
      divEl.style.visibility = "hidden";
      document.images[thisBtn].src = themeDir + "/theme-gfx/timeline-tab.png";
    }
  } 
}