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diff --git a/bundles/org.eclipse.compare/compare/org/eclipse/compare/NavigationAction.java b/bundles/org.eclipse.compare/compare/org/eclipse/compare/NavigationAction.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.compare;
+
+import java.util.ResourceBundle;
+import org.eclipse.jface.action.Action;
+import org.eclipse.jface.dialogs.MessageDialog;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Shell;
+
+import org.eclipse.compare.internal.CompareMessages;
+import org.eclipse.compare.internal.CompareUIPlugin;
+import org.eclipse.compare.internal.Utilities;
+
+
+/**
+ * A <code>NavigationAction</code> is used to navigate through the individual
+ * differences of a <code>CompareEditorInput</code>.
+ * <p>
+ * Clients may instantiate this class; it is not intended to be subclassed.
+ * </p>
+ * @since 2.0
+ * @noextend This class is not intended to be subclassed by clients.
+ */
+public class NavigationAction extends Action {
+	
+	private boolean fNext;
+	private CompareEditorInput fCompareEditorInput;
+	
+	
+	/**
+	 * Creates a <code>NavigationAction</code>.
+	 *
+	 * @param next if <code>true</code> action goes to the next difference; otherwise to the previous difference.
+	 */
+	public NavigationAction(boolean next) {
+		this(CompareUI.getResourceBundle(), next);
+	}
+
+	/**
+	 * Creates a <code>NavigationAction</code> that initializes its attributes
+	 * from the given <code>ResourceBundle</code>.
+	 *
+	 * @param bundle is used to initialize the action
+	 * @param next if <code>true</code> action goes to the next difference; otherwise to the previous difference.
+	 */
+	public NavigationAction(ResourceBundle bundle, boolean next) {
+		Utilities.initAction(this, bundle, next ? "action.Next." : "action.Previous."); //$NON-NLS-2$ //$NON-NLS-1$
+		fNext= next;
+	}
+
+	public void run() {
+		if (fCompareEditorInput != null) {
+			Object adapter= fCompareEditorInput.getAdapter(ICompareNavigator.class);
+			if (adapter instanceof ICompareNavigator) {
+				boolean atEnd= ((ICompareNavigator)adapter).selectChange(fNext);
+				Shell shell= CompareUIPlugin.getShell();
+				if (atEnd && shell != null) {
+					
+					Display display= shell.getDisplay();
+					if (display != null)
+						display.beep();
+
+					String title;
+					String message;
+					if (fNext) {
+						title= CompareMessages.CompareNavigator_atEnd_title; 
+						message= CompareMessages.CompareNavigator_atEnd_message; 
+					} else {
+						title= CompareMessages.CompareNavigator_atBeginning_title; 
+						message= CompareMessages.CompareNavigator_atBeginning_message; 
+					}
+					MessageDialog.openInformation(shell, title, message);
+				}
+			}
+		}
+	}
+	
+	/**
+	 * Sets the <code>CompareEditorInput</code> on which this action operates.
+	 * 
+	 * @param input the <code>CompareEditorInput</code> on which this action operates; if <code>null</code> action does nothing
+	 */
+	public void setCompareEditorInput(CompareEditorInput input) {
+		fCompareEditorInput= input;
+	}
+}