diff --git a/lib/OpenLayers/Control/PanZoomBar.js b/lib/OpenLayers/Control/PanZoomBar.js
index 7efb1d8eb1..ab3c8848fa 100644
--- a/lib/OpenLayers/Control/PanZoomBar.js
+++ b/lib/OpenLayers/Control/PanZoomBar.js
@@ -86,9 +86,11 @@ OpenLayers.Control.PanZoomBar.prototype =
                         imgLocation+"zoombar.png");
         }
         
+        this.zoombarDiv = div;
+        
         this.divEvents = new OpenLayers.Events(this, div);
         this.divEvents.register("mousedown", this, this.divClick);
-        this.divEvents.register("mousemove", this, this.zoomBarDivDrag);
+        this.divEvents.register("mousemove", this, this.passEventToSlider);
         this.divEvents.register("dblclick", this, this.doubleClick);
         
         this.div.appendChild(div);
@@ -109,26 +111,25 @@ OpenLayers.Control.PanZoomBar.prototype =
         Event.stop(evt);
     },
     zoomBarDown:function(evt) {
-        this.map.events.register("mousemove", this, this.mapMouseDrag);
-        this.map.events.register("mouseup", this, this.mapMouseUp);
+        this.map.events.register("mousemove", this, this.passEventToSlider);
+        this.map.events.register("mouseup", this, this.passEventToSlider);
         this.mouseDragStart = evt.xy.copyOf();
         this.zoomStart = evt.xy.copyOf();
         this.div.style.cursor = "move";
         Event.stop(evt);
     },
-    mapMouseDrag:function(evt) {
-        this.sliderEvents.handleBrowserEvent(evt);
-    },
-    mapMouseUp:function(evt) {
-        this.sliderEvents.handleBrowserEvent(evt);
-    },
-    zoomBarDivDrag: function(evt) {
+    passEventToSlider:function(evt) {
         this.sliderEvents.handleBrowserEvent(evt);
     },
     zoomBarDrag:function(evt) {
         if (this.mouseDragStart != null) {
             var deltaY = this.mouseDragStart.y - evt.xy.y
-            this.slider.style.top = (parseInt(this.slider.style.top)-deltaY)+"px";
+            var offsets = Position.page(this.zoombarDiv);
+            if ((evt.clientY - offsets[1]) > 0 && 
+                (evt.clientY - offsets[1]) < parseInt(this.zoombarDiv.style.height) - 2) {
+                var newTop = parseInt(this.slider.style.top) - deltaY;
+                this.slider.style.top = newTop+"px";
+            }
             this.mouseDragStart = evt.xy.copyOf();
         }
         Event.stop(evt);