Array help...

I think I have spent too much time programming in the last week, because my brain has just died.

Basically, if I had a 2D array set up like so:-

00000
00000
00000
00200
32422

How could I shuffle the area so that it adds a row of 1's to the bottom, then upwards, e..g:-

00000
00000
00000
00200
32422

00000
00000
00200
32422
11111

00000
00200
32422
11111
11111

etc etc

cheers! :)

Dabz