diff --git a/lib/OpenLayers/Control/LayerSwitcher.js b/lib/OpenLayers/Control/LayerSwitcher.js
index 8a6d3e324b..0ed3560c4e 100644
--- a/lib/OpenLayers/Control/LayerSwitcher.js
+++ b/lib/OpenLayers/Control/LayerSwitcher.js
@@ -551,14 +551,13 @@ OpenLayers.Control.LayerSwitcher =
         }
 
         var imgLocation = OpenLayers.Util.getImagesLocation();
-        var sz = new OpenLayers.Size(18,18);        
 
         // maximize button div
         var img = imgLocation + 'layer-switcher-maximize.png';
         this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv(
                                     "OpenLayers_Control_MaximizeDiv", 
                                     null, 
-                                    sz, 
+                                    null, 
                                     img, 
                                     "absolute");
         OpenLayers.Element.addClass(this.maximizeDiv, "maximizeDiv");
@@ -571,11 +570,10 @@ OpenLayers.Control.LayerSwitcher =
 
         // minimize button div
         var img = imgLocation + 'layer-switcher-minimize.png';
-        var sz = new OpenLayers.Size(18,18);        
         this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv(
                                     "OpenLayers_Control_MinimizeDiv", 
                                     null, 
-                                    sz, 
+                                    null, 
                                     img, 
                                     "absolute");
         OpenLayers.Element.addClass(this.minimizeDiv, "minimizeDiv");
diff --git a/lib/OpenLayers/Control/OverviewMap.js b/lib/OpenLayers/Control/OverviewMap.js
index c1b2ff7922..38a63476e8 100644
--- a/lib/OpenLayers/Control/OverviewMap.js
+++ b/lib/OpenLayers/Control/OverviewMap.js
@@ -244,7 +244,7 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
             this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv(
                                         this.displayClass + 'MaximizeButton', 
                                         null, 
-                                        new OpenLayers.Size(18,18), 
+                                        null, 
                                         img, 
                                         'absolute');
             this.maximizeDiv.style.display = 'none';
@@ -260,7 +260,7 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
             this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv(
                                         'OpenLayers_Control_minimizeDiv', 
                                         null, 
-                                        new OpenLayers.Size(18,18), 
+                                        null, 
                                         img, 
                                         'absolute');
             this.minimizeDiv.style.display = 'none';
diff --git a/theme/default/style.css b/theme/default/style.css
index c4a72b706c..ea8e520890 100644
--- a/theme/default/style.css
+++ b/theme/default/style.css
@@ -92,6 +92,8 @@ div.olControlMousePosition {
 
 .olControlOverviewMapMinimizeButton,
 .olControlOverviewMapMaximizeButton {
+    height: 18px;
+    width: 18px;
     right: 0;
     bottom: 80px;
     cursor: pointer;
@@ -336,6 +338,8 @@ div.olControlSaveFeaturesItemInactive {
 
 .olControlLayerSwitcher .maximizeDiv,
 .olControlLayerSwitcher .minimizeDiv {
+    width: 18px;
+    height: 18px;
     top: 5px;
     right: 0;
     cursor: pointer;