http://www.ipodhacking.com/forum/showthread.php?t=1146
It's the same thing as if you want to move it, but you make it bigger, it's not resizing, it's to make the picture to take more space on the screen. You will still need to use the top, left,bottom and right value to ''resize'' it, Otherwise, there's no way to do it. So just do the same thing as you wanted to move it but move each side by the same amount of number...Ex: Original:
Top=30
Bottom=30
Right=20
Left=20
Modded to make it bigger:
Top=15
Bottom=15
Right=5
Left=5
You don't need to respect the same changes to each value but if you want to make a pic bigger and the numbers are positive numbers, you make the number smaller but higher than 0...
It's the same thing to make it smaller, you make the value bigger so the picture is becoming smaller. Hope it helped you