[xRyder]

Here you go mate:

pawn Код:

COMMAND:skin(playerid, params[])
{
    new skinid;
    if(!sscanf(params, "i",skinid))
    {
        if(skinid < 300)
        {
            SetPlayerSkin(playerid, skinid);
            SendClientMessage(playerid, COLOR_WHITE," You have new skin!! Wooho!");
        }
        else return SendClientMessage(playerid, COLOR_LIGHTRED,"Please use skin ID's between 0 and 299!");
    }
    else return SendClientMessage(playerid, COLOR_WHITE,"Usage: /skin [ID (0-299)]");
    return 1;
}

This is rough example. You should code it a little bit more if you want to solve all the bugs that comes with that command.