Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/JMapViewer.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/JMapViewer.java	(revision 11103)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/JMapViewer.java	(revision 11104)
@@ -485,4 +485,9 @@
 	 */
 	protected void zoomChanged(int oldZoom) {
+		zoomSlider.setToolTipText("Zoom level " + zoom);
+		zoomInButton.setToolTipText("Zoom to level " + (zoom + 1));
+		zoomOutButton.setToolTipText("Zoom to level " + (zoom - 1));
+		zoomOutButton.setEnabled(zoom > 0);
+		zoomInButton.setEnabled(zoom < tileSource.getMaxZoom());
 	}