android tablet resolution? how to restrict

i have optimized my app for tablets, i was testing on two resolutions on 10inch tablets for 1280x800 and 1024 x 600 and it is working fine. i would like the app to be available for all tablets with these resolutions, how to do that? and to make it unavailable to the market if the device is with lower res?

i see that in the android manifest file there is a section like this:

 <supports-screens
    android:smallScreens="true"
    android:normalScreens="true"
    android:largeScreens="true"
    android:xlargeScreens="true"
    android:anyDensity="true" />

is this where i do this, and what smallScreens,normaScreens,etc mean?

thanks