revert, have to think about this

Author: rbri

src/main/java/org/htmlunit/javascript/host/event/EventHandler.java

@@ -64,9 +64,9 @@ public Object call(final Context cx, final Scriptable scope,
         if (realFunction_ == null) {
             final String js = "function on" + eventName_ + "(event) { " + jsSnippet_ + " \n}";
             // HtmlUnitScriptable scope = scope.getTopLevelScope(scope);
-            realFunction_ = cx.compileFunction(scope, js, eventName_ + " event for " + node_
+            realFunction_ = cx.compileFunction(thisObj, js, eventName_ + " event for " + node_
                                     + " in " + node_.getPage().getUrl(), 0, null);
-            realFunction_.setParentScope(scope);
+            realFunction_.setParentScope(thisObj);
         }
 
         return realFunction_.call(cx, scope, thisObj, args);