make timeline not draggable and not selectable

icf.css

@@ -76,6 +76,7 @@ em, i {
 #timeline > img {
     height: 64px;
     position: absolute;
+    user-select: none;
 }
 
 #menu {

icf.js

@@ -208,7 +208,7 @@ loadText(function() {
     hashchange()
     loadTimeline(function() {
         window.addEventListener('resize', renderTimeline)
-        timeline.addEventListener('mousedown', function() {
+        timeline.addEventListener('dragstart', function() {
             return false
         })
         timeline.addEventListener('mouseenter', start)