diff --git a/src/java/com/threerings/jme/effect/FadeInOutEffect.java b/src/java/com/threerings/jme/effect/FadeInOutEffect.java
index 7dae97914..65a4a3abc 100644
--- a/src/java/com/threerings/jme/effect/FadeInOutEffect.java
+++ b/src/java/com/threerings/jme/effect/FadeInOutEffect.java
@@ -122,9 +122,11 @@ public class FadeInOutEffect extends Node
 
     /**
      * Called (only once) when we have reached the end of our fade.
+     * Automatically detaches this effect from the hierarchy.
      */
     protected void fadeComplete ()
     {
+        getParent().detachChild(this);
     }
 
     /**
diff --git a/src/java/com/threerings/jme/effect/WindowSlider.java b/src/java/com/threerings/jme/effect/WindowSlider.java
new file mode 100644
index 000000000..fb237a3c1
--- /dev/null
+++ b/src/java/com/threerings/jme/effect/WindowSlider.java
@@ -0,0 +1,93 @@
+//
+// $Id$
+
+package com.threerings.jme.effect;
+
+import com.jme.scene.Node;
+import com.jme.system.DisplaySystem;
+
+import com.jmex.bui.BWindow;
+
+import com.threerings.jme.util.LinearTimeFunction;
+import com.threerings.jme.util.TimeFunction;
+
+/**
+ * Slides a window onto the center of the screen from offscreen or offscreen
+ * from the center of the screen.
+ */
+public class WindowSlider extends Node
+{
+    public static final int FROM_TOP = 0;
+    public static final int FROM_RIGHT = 1;
+    public static final int TO_TOP = 2;
+    public static final int TO_RIGHT = 3;
+
+    public WindowSlider (BWindow window, int mode, float duration)
+    {
+        super("slider");
+
+        DisplaySystem ds = DisplaySystem.getDisplaySystem();
+        int swidth = ds.getWidth(), sheight = ds.getHeight();
+        int wwidth = window.getWidth(), wheight = window.getHeight();
+
+        int start = 0, end = 0;
+        switch (mode) {
+        case FROM_TOP:
+            start = sheight+wheight;
+            end = (sheight-wheight)/2;
+            window.setLocation((swidth-wwidth)/2, start);
+            break;
+
+        case FROM_RIGHT:
+            start = swidth+wwidth;
+            end = (swidth-wwidth)/2;
+            window.setLocation(start, (sheight-wheight)/2);
+            break;
+
+        case TO_TOP:
+            start = (sheight-wheight)/2;
+            end = sheight+wheight;
+            window.setLocation((swidth-wwidth)/2, start);
+            break;
+
+        case TO_RIGHT:
+            start = (swidth-wwidth)/2;
+            end = swidth+wwidth;
+            window.setLocation(start, (sheight-wheight)/2);
+            break;
+        }
+
+        _mode = mode;
+        _window = window;
+        _tfunc = new LinearTimeFunction(start, end, duration);
+    }
+
+    // documentation inherited
+    public void updateGeometricState (float time, boolean initiator)
+    {
+        super.updateGeometricState(time, initiator);
+
+        if (_mode % 2 == 1) {
+            _window.setLocation((int)_tfunc.getValue(time), _window.getY());
+        } else {
+            _window.setLocation(_window.getX(), (int)_tfunc.getValue(time));
+        }
+
+        if (_tfunc.isComplete()) {
+            slideComplete();
+        }
+    }
+
+    /**
+     * Called (only once) when we have reached the end of our slide.
+     * Automatically detaches this effect from the hierarchy.
+     */
+    protected void slideComplete ()
+    {
+        getParent().detachChild(this);
+    }
+
+    protected int _mode;
+    protected BWindow _window;
+    protected TimeFunction _tfunc;
+}