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diff --git a/java/gjt/ImageButtonController.java b/java/gjt/ImageButtonController.java
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+package gjt;
+import java.awt.Event;
+
+/**
+ * A controller for an ImageButton, this abstract class 
+ * establishes the association between itself and an ImageButton
+ * and delivers events to its ImageButton.<p>
+ *
+ * ImageButtonControllers must be constructed with an 
+ * ImageButton; the ImageButton's controller gets set by 
+ * ImageButtonController's constructor.<p>
+ *
+ * The ImageButton passed into the constructor must not be null; 
+ * this is enforced by an assertion.<p>
+ *
+ * Methods defined in the MouseController interface are left 
+ * for subclasses to implement.  ImageButtonController defines
+ * mouseMove(), mouseEnter() and mouseExit() as no-ops, so
+ * that extensions of ImageButtonController only have to
+ * implement mouseDown(), mouseUp() and mouseDrag().  Note
+ * that extensions are still free to override mouseMove(),
+ * mouseEnter() and mouseExit() if desired.<p>
+ *
+ * Subclasses should also call the protected XXXButton(Event)
+ * methods below, where XXX is either arm, disarm, activate, or
+ * deactivate as appropriate.  SpringyImageButtonController is
+ * a good example of this (so is StickyImageButtonController,
+ * but it is more complicated than it's springy sibling).<p>
+ *
+ * @version 1.0, Apr 1 1996
+ * @author  David Geary
+ * @see     MouseController
+ * @see     ImageButton
+ * @see     ImageButtonEvent
+ * @see     SpringyImageButtonController
+ * @see     StickyImageButtonController
+ * @see     gjt.test.ImageButtonTest
+ */
+public abstract class ImageButtonController 
+         implements MouseController {
+    private ImageButton button;
+
+    ImageButtonController(ImageButton button) {
+        Assert.notNull(button);
+        this.button = button;
+        button.setController(this);
+    }
+    public ImageButton getButton() {
+        return button;
+    }
+    public boolean mouseEnter(Event event, int x, int y) {
+        return false;
+    }
+    public boolean mouseExit (Event event, int x, int y) {
+        return false;
+    }
+    public boolean mouseMove (Event event, int x, int y) {
+        return false;
+    }
+
+    protected void armButton(Event event) {
+        button.deliverEvent(
+            new ImageButtonEvent(button, 
+                                 event, 
+                                 ImageButtonEvent.ARM));
+    }
+    protected void disarmButton(Event event) {
+        button.deliverEvent(
+            new ImageButtonEvent(button, 
+                                 event, 
+                                 ImageButtonEvent.DISARM));
+    }
+    protected void activateButton(Event event) {
+        button.deliverEvent(
+            new ImageButtonEvent(button, 
+                                 event, 
+                                 ImageButtonEvent.ACTIVATE));
+    }
+}