[Klutty]

pawn Code:

new string[128];
    new playername[MAX_PLAYER_NAME];
    GetPlayerName(playerid,playername,sizeof(playername));
    format(string, sizeof(string), "%s has joined the server!",playername);
    SendClientMessageToAll(*color here*,string);

That should do it.

Cheers,

Klutty.