Your flags wont work too well, the cloth is draw by the soldat game itself not from a .bmp file.
You could edit the flag texture file to be light with a dark jolly rodger design in the middle but it might still be hard to see.
How about these
Those flags won't work as well. What he's saying is, that the actual flag, the soft stuff that waves in the wind(cloth), is not a part of the .png as the stick to which it's strapped. The stick is just an ordinary .png, while the flag is made to move (almost) independantly of that .png.
See?