[judothijs]

pawn Code:

new randomsize = [MAX_PLAYERS];
new randomnumber = random(sizeof(randomsize));

for(new i = 0; i < [MAX_PLAYERS]);
{
       if( randomnumber == playerid(i))
       {
                // Your teamswitching code...
                return 1;
        }
        else
        {
            i++;
         }
         return 1;
}

Copy + paste might not work as I just wrote what came up to me, but the idea is simple.