[cosbraa]

pawn Code:

stock strsplit(source[], first[], second[], split_pos)
{
    strmid(source, first, 0, split_pos);
    strins(first, "-", split_pos);
    strmid(source, second, split_pos, strlen(source));
    return 1;
}

I had something like this, don't have access to it right now.
Might have to play around with it, but it worked for me.