map preview again !!!

map preview again !!!

plz help !! have a problem again with this f***ing mappreview
when I made a new .tga and load the map, there is always the pic of micro arena which i used the first time for testing of course
HOW CAN I CHANGE IT ??

1) Remove previous minimap image from map.
2) Import new TGA, be sure it is in good resoultion and palette (don't remember how much bits )
3) Dbl-click it in Import Manager.
4) Check "Custom path".
5) Type "war3mapPreview.tga" against existing path.

nooby i think it was 32 bit and the picture must have the size 128x128 or 256x256 otherwhise it wont work