nav mods

Change-Id: I80afd61d8d85b39fdeefacb1303294a33f696b75
diff --git a/res/drawable/nav_screen_bg.xml b/res/drawable/nav_screen_bg.xml
new file mode 100644
index 0000000..7ca4e78
--- /dev/null
+++ b/res/drawable/nav_screen_bg.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<shape
+    xmlns:android="http://schemas.android.com/apk/res/android">
+    <gradient
+        android:type="linear"
+        android:startColor="#ff000000"
+        android:centerColor="#ff808080"
+        android:endColor="#ff000000"
+        android:centerY="0.2"
+        android:angle="90" />
+</shape>