Fixed wrong labels

index.html

@@ -160,19 +160,19 @@ The source code of the examples can be found in the
   <div class="thumb">
     <a href="examples/timeline/06_event_listeners.html">
       <img src="img/gallery/timeline/06_event_listeners.png">
-      <div>groups</div>
+      <div>event listeners</div>
     </a>
   </div>
   <div class="thumb">
     <a href="examples/timeline/07_custom_time_bar.html">
       <img src="img/gallery/timeline/07_custom_time_bar.png">
-      <div>groups</div>
+      <div>custom time bar</div>
     </a>
   </div>
   <div class="thumb">
     <a href="examples/timeline/08_edit_items.html">
       <img src="img/gallery/timeline/08_edit_items.png">
-      <div>groups</div>
+      <div>edit items</div>
     </a>
   </div>
 </div>