diff -r 2fa85847ccf7 -r 859804c78010 javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/Element.java
--- a/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/Element.java	Tue Mar 05 19:00:36 2013 +0100
+++ b/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/Element.java	Thu Mar 14 09:22:28 2013 +0100
@@ -17,6 +17,8 @@
  */
 package org.apidesign.bck2brwsr.htmlpage.api;
 
+import javafx.scene.web.WebEngine;
+import netscape.javascript.JSObject;
 import org.apidesign.bck2brwsr.core.JavaScriptBody;
 
 /** Represents a generic HTML element.
@@ -73,13 +75,26 @@
         + "};\n"
     )
     final void on(OnEvent ev, OnHandler r) {
+        WebEngine e = web();
+        JSObject add = (JSObject)e.executeScript(
+              "var x = {}; x.add = new Function('e','attr','r', "
+            + "  'window.document.getElementById(e)[attr] = function(ev) { var d = ev ? ev : null; try { r.onEvent(d); } catch (x) { alert(\"OK\" + r[\"onEvent\"] + \"e\" + d + x); } };'"
+            + "); x;");
+        add.call("add", id, ev.id, r);
+    }
+    
+    private static WebEngine web() {
+        return (WebEngine) System.getProperties().get("webEngine");
     }
 
     /** Shows alert message dialog in a browser.
      * @param msg the message to show
      */
     @JavaScriptBody(args = "msg", body = "alert(msg);")
-    public static native void alert(String msg);
+    public static void alert(String msg) {
+        JSObject obj = (JSObject) web().executeScript("window");
+        obj.call("alert", msg);
+    }
 
     /** Generic way to query any attribute of this element.
      * @param property name of the attribute