Invert mouse look?

Hi,

Not sure if this is the right place to post this, so sorry if it isnt!

I have just started playing medieval on my laptop, and as it does not have a numpad i am using the mouse look alot more. As i play fps titles with the mouse inverted i was wondering if there is a way to invert the mouse look option at all?
Im not sure which file to open to attempt any changes.

Any help would be great thanks.

I don't think there is a way to change it... I think.
If it'd be anywhere, it'd be in options in the main-menu. Well, one would assume.

There are no options to invert the mouse so i was wondering if its possible to edit a file to do this?