Added more JS event handler implementations.

www/js/ts.js

@@ -17,3 +17,18 @@ function toggleTimelineInfo(event) {
     event.preventDefault();
 }
 
+function showTimelineMenu(event) {
+    alert("TODO: show other timelines via a popup menu");
+    event.preventDefault();
+}
+
+function updateTimeline(event) {
+    alert("TODO: update timeline via AJAX.");
+    event.preventDefault();
+}
+
+function logout(event) {
+    alert("TODO: log user out via AJAX.");
+    event.preventDefault();
+}
+