  <!-- hide 
  if (document.images) {
  principal_14_f2 = new Image(111 ,30); principal_14_f2.src = "/graphics/principal_14_over.jpg";
  principal_14_f1 = new Image(111 ,30); principal_14_f1.src = "/graphics/principal_14.jpg";
  principal_15_f2 = new Image(111 ,29); principal_15_f2.src = "/graphics/principal_15_over.jpg";
  principal_15_f1 = new Image(111 ,29); principal_15_f1.src = "/graphics/principal_15.jpg";
  principal_16_f2 = new Image(111 ,28); principal_16_f2.src = "/graphics/principal_16_over.jpg";
  principal_16_f1 = new Image(111 ,28); principal_16_f1.src = "/graphics/principal_16.jpg";
  principal_17_f2 = new Image(111 ,29); principal_17_f2.src = "/graphics/principal_17_over.jpg";
  principal_17_f1 = new Image(111 ,29); principal_17_f1.src = "/graphics/principal_17.jpg";
  }
  // stop hiding -->