[android-developers] alignment of imagebuttons in the image background

Hii,
I have three image buttons which i want to aligne center vertically.i
have layout something like this:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/homepage_image"
android:gravity="center_horizontal"
>

<ImageButton
android:id="@+id/btnSequence"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/btn_sequence"
android:scaleType="center"
/>

<ImageButton
android:id="@+id/btnVideo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/btn_video"
android:scaleType="center"
/>

<ImageButton
android:id="@+id/btnInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/btn_info"
android:scaleType="center"
/>
</LinearLayout>

although i have tried frame and relative but then image are
overlapping each other.

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