you need to setup the margin settings in the config.

there is a value for top and bottom.

first one needs 1/2 of your desktop height as a top-margin
second one needs 1/2 of your desktop height as a bottom-margin

i.e.

desktop size: 1024 x 768 (width x height)

768 / 2 = 384

## Arguments are top,bottom,left,right

#first one:
margin = 384,0,0,0

#second one:
margin = 0,384,0,0