[JaydenJason]

Код:

CMD:setskin(playerid, params)
{
	new skinid;
	if(sscanf(params, "i", skinid))
	{
		if(skinid < 0 || skinid > 311) return SendClientMessage(playerid, -1, "Don't go lower than 0, or higher than 311");
		SetPlayerSkin(playerid, skinid);
	}
	return 1;
}

note, if you can't make such simple thing, search for "SSCANF" and install that too, you need it for this.

(if it doesn't work, replace "return SendClientMessage(playerid, -1, "Don't go lower than 0, or higher than 311");" with "SendClientMessage(playerid, -1, "Don't go lower than 0, or higher than 311");"