Mplayer CE 0.76 Aspect Ratio

Hi all!

How do I change the aspect ratio in Mplayer CE 0.76

It use 16:9 as default, but I want to change to 4:3 as default.
Where do I do that?

Wii system menu I believe or you can hold Z on the nunchuk and use the control stick to move it around

Answer:
Put this in file mplayer.conf

To get 4:3 as default write this:
aspect=1.333

To get 16:9 as default write this:
aspect=1.7778