replace the "lightmap" texture with another bitmap. You must define a BMAP* and use the same name + _bmap in the shader code. Example:

in the script:
Code:
BMAP* lightmap123 = "lightmap123.tga";

in the shader:
Code:
texture lightmap123_bmap;
...
...
texture[1] = <lightmap123_bmap>;
...
...