diff --git a/website/o3dv/js/navigator.js b/website/o3dv/js/navigator.js
index d0052bd..474adb7 100644
--- a/website/o3dv/js/navigator.js
+++ b/website/o3dv/js/navigator.js
@@ -59,6 +59,11 @@ OV.Navigator = class
 
         this.panelSet.Init ({
             onResize : () => {
+                if (this.panelSet.IsPanelsVisible ()) {
+                    this.splitterDiv.show ();
+                } else {
+                    this.splitterDiv.hide ();
+                }
                 this.callbacks.onResize ();
             }
         });
@@ -116,7 +121,10 @@ OV.Navigator = class
     GetWidth ()
     {
         let navigatorWidth = parseInt (this.mainDiv.outerWidth (true), 10);
-        let splitterWidth = parseInt (this.splitterDiv.outerWidth (true), 10);
+        let splitterWidth = 0;
+        if (this.panelSet.IsPanelsVisible ()) {
+            splitterWidth = parseInt (this.splitterDiv.outerWidth (true), 10);
+        }
         return navigatorWidth + splitterWidth;
     }
 
diff --git a/website/o3dv/js/panelset.js b/website/o3dv/js/panelset.js
index d9d384f..1a3c560 100644
--- a/website/o3dv/js/panelset.js
+++ b/website/o3dv/js/panelset.js
@@ -56,6 +56,7 @@ OV.PanelSet = class
         this.contentDiv = $('<div>').addClass ('ov_panel_set_content').appendTo (parentDiv);
         this.panels = [];
         this.panelsVisible = true;
+        this.panelsPrevWidth = null;
         this.callbacks = null;
     }
 
@@ -75,14 +76,19 @@ OV.PanelSet = class
         let button = OV.AddSvgIcon (this.menuDiv, panel.GetIcon (), 'ov_panel_set_menu_button');
         button.click (() => {
             if (panel === this.GetVisiblePanel ()) {
-                //this.ShowPanels (false);
+                this.ShowPanels (false);
             } else {
-                //this.ShowPanels (true);
+                this.ShowPanels (true);
                 this.ShowPanel (panel);
             }
         });
     }
 
+    IsPanelsVisible ()
+    {
+        return this.panelsVisible;
+    }
+
     ShowPanels (show)
     {
         if (this.panelsVisible === show) {
@@ -92,8 +98,12 @@ OV.PanelSet = class
         this.panelsVisible = show;
         if (this.panelsVisible) {
             this.contentDiv.show ();
+            this.parentDiv.outerWidth (this.menuDiv.outerWidth (true) + this.panelsPrevWidth, true);
+            this.callbacks.onResize ();
         } else {
+            this.panelsPrevWidth = this.contentDiv.outerWidth (true);
             this.contentDiv.hide ();
+            this.parentDiv.outerWidth (this.menuDiv.outerWidth (true), true);
             this.callbacks.onResize ();
         }
     }