diff -r 4c7b33bf2795 -r f11b234497f7 src/widgets/Mediafragment.js
--- a/src/widgets/Mediafragment.js	Thu Apr 26 19:18:57 2012 +0200
+++ b/src/widgets/Mediafragment.js	Fri Apr 27 19:18:21 2012 +0200
@@ -2,7 +2,10 @@
     IriSP.Widgets.Widget.call(this, player, config);
     this.last_hash = "";
     window.onhashchange = this.functionWrapper("goToHash");
-    this.player.bindPopcorn("pause","setHashToTime");
+    this.bindPopcorn("pause","setHashToTime");
+    this.bindPopcorn("seeked","setHashToTime");
+    this.bindPopcorn("IriSP.Mediafragment.setHashToAnnotation","setHashToAnnotation");
+    this.blocked = false;
 }
 
 IriSP.Widgets.Mediafragment.prototype = new IriSP.Widgets.Widget();
@@ -28,17 +31,34 @@
 }
 
 IriSP.Widgets.Mediafragment.prototype.setHashToAnnotation = function(_annotationId) {
-    this.last_hash = '#id=' + this.source.unNamespace(_annotationId);
-    
+    this.setHash( '#id=' + this.source.unNamespace(_annotationId) );
 }
 
-IriSP.Widgets.Mediafragment.prototype.setHashToTime = function() {
-    this.last_hash = '#t=' + this.source.popcorn.currentTime();
+IriSP.Widgets.Mediafragment.prototype.setHashToTime = function(_time) {
+    _time = (typeof _time !== "undefined" ? _time : this.player.popcorn.currentTime() );
+    this.setHash( '#t=' + _time );
 }
 
 IriSP.Widgets.Mediafragment.prototype.setHash = function(_hash) {
-    if (this.last_hash !== _hash) {
+    if (!this.blocked && this.last_hash !== _hash) {
         this.last_hash = _hash;
         document.location.hash = _hash;
+        this.block();
     }
-}
\ No newline at end of file
+}
+
+IriSP.Widgets.Mediafragment.prototype.unblock = function() {
+    if (typeof this.blockTimeout !== "undefined") {
+        window.clearTimeout(this.blockTimeout);
+    }
+    this.blockTimeout = undefined;
+    this.blocked = false;
+}
+
+IriSP.Widgets.Mediafragment.prototype.block = function() {
+    if (typeof this.blockTimeout !== "undefined") {
+        window.clearTimeout(this.blockTimeout);
+    }
+    this.blocked = true;
+    this.blockTimeout = window.setTimeout(this.functionWrapper("unblock"), 1000);
+}