onload = function() {
  var eswitch, i = 0;
  while (eswitch = document.getElementsByTagName ('B') [i++]) {
    if (eswitch.className == 'switch') {
    eswitch.onclick = function () {
      this.className = this.className == 'switch' ? 'switch off' : 'switch';
      this.nextSibling.className = this.className == 'switch' ? 'hide' : 'show';
      }
    }
  }
}