diff -r c66260a734ca -r eb3c442cec50 src/js/model.js
--- a/src/js/model.js	Wed Aug 29 18:32:34 2012 +0200
+++ b/src/js/model.js	Wed Aug 29 18:34:11 2012 +0200
@@ -86,6 +86,7 @@
     Array.call(this);
     this.directory = _directory;
     this.idIndex = [];
+    this.__events = {};
     if (typeof _directory == "undefined") {
         console.trace();
         throw "Error : new IriSP.Model.List(directory): directory is undefined";
@@ -259,6 +260,20 @@
     });
 }
 
+IriSP.Model.List.prototype.on = function(_event, _callback) {
+    if (typeof this.__events[_event] === "undefined") {
+        this.__events[_event] = [];
+    }
+    this.__events[_event].push(_callback);
+}
+
+IriSP.Model.List.prototype.trigger = function(_event, _data) {
+    var _list = this;
+    IriSP._(this.__events[_event]).each(function(_callback) {
+        _callback.call(_list, _data);
+    });
+}
+
 /* A simple time management object, that helps converting millisecs to seconds and strings,
  * without the clumsiness of the original Date object.
  */
@@ -383,6 +398,7 @@
     this.id = _id;
     this.title = "";
     this.description = "";
+    this.__events = {}
     this.source.directory.addElement(this);
 }
 
@@ -409,6 +425,20 @@
     });
 }
 
+IriSP.Model.Element.prototype.on = function(_event, _callback) {
+    if (typeof this.__events[_event] === "undefined") {
+        this.__events[_event] = [];
+    }
+    this.__events[_event].push(_callback);
+}
+
+IriSP.Model.Element.prototype.trigger = function(_event, _data) {
+    var _element = this;
+    IriSP._(this.__events[_event]).each(function(_callback) {
+        _callback.call(_element, _data);
+    });
+}
+
 /* */
 
 IriSP.Model.Media = function(_id, _source) {