Custom Minimap

I downloaded the Warcup map, and noticed that instead of having a picture of the minimap on the map description, it had a picture of an orc, human, and soccerball. Can anyone explain to me how to do this? Thanks.

replace the war3map.blp with a new image

Get w3m map utilities from http://w3m_eng.wo.to/. It will do this for you, and a lot of other cool stuff, like lock maps and fix wait bugs, etc.

Alright, I'll try it, thanks.:D