diff --git a/lib/OpenLayers/Control/PanZoomBar.js b/lib/OpenLayers/Control/PanZoomBar.js
index 267f41a031..05e3bb8378 100644
--- a/lib/OpenLayers/Control/PanZoomBar.js
+++ b/lib/OpenLayers/Control/PanZoomBar.js
@@ -44,17 +44,21 @@ OpenLayers.Control.PanZoomBar.prototype =
         this._addButton("pandown", "south-mini.png", centered.add(0, sz.h*2), sz);
         this._addButton("zoomin", "zoom-plus-mini.png", centered.add(0, sz.h*3), sz);
         centered = centered.add(0, sz.h*4);
-        centered = this._addZoomBar(centered,sz.copyOf());
+        centered = this._addZoomBar(centered);
         this._addButton("zoomout", "zoom-minus-mini.png", centered, sz);
         return this.div;
     },
-    _addZoomBar:function(centered,sz) {
+
+    /** 
+    * @param {OpenLayers.Pixel} location where zoombar drawing is to start.
+    */
+    _addZoomBar:function(centered) {
         var imgLocation = OpenLayers.Util.getImagesLocation();
         
-        var zoomStopSize = this.zoomStopHeight;
         var id = "OpenLayers_Control_PanZoomBar_Slider" + this.map.id;
         var slider = OpenLayers.Util.createAlphaImageDiv(id,
-                       centered.add(-1, (this.map.getZoomLevels())*zoomStopSize), 
+                       centered.add(-1, 
+                         (this.map.getZoomLevels())*this.zoomStopHeight), 
                        new OpenLayers.Size(20,9), 
                        imgLocation+"slider.png",
                        "absolute");
@@ -67,14 +71,16 @@ OpenLayers.Control.PanZoomBar.prototype =
         this.sliderEvents.register("mouseup", this, this.zoomBarUp);
         this.sliderEvents.register("dblclick", this, this.doubleClick);
         
-        sz.h = zoomStopSize*(this.map.getZoomLevels()+1);
+        sz = new OpenLayers.Size();
+        sz.h = this.zoomStopHeight*(this.map.getZoomLevels()+1);
         sz.w = this.zoomStopWidth;
         var div = null
         
         if (OpenLayers.Util.alphaHack()) {
             var id = "OpenLayers_Control_PanZoomBar" + this.map.id;
             div = OpenLayers.Util.createAlphaImageDiv(id, centered,
-                                      new OpenLayers.Size(sz.w, zoomStopSize),
+                                      new OpenLayers.Size(sz.w, 
+                                              this.zoomStopHeight),
                                       imgLocation + "zoombar.png", 
                                       "absolute", null, "crop");
             div.style.height = sz.h;