Mine

new RK[][] = {
{ "MadHacker04" },
{ "Goldkiller" },
{ "Onkelz" },
{ "Syrings" },
{ "Crawlix" },
{ "oldsql*falKkon" },
{ "Dagett" },
{ "oldsql*Hacker04" },
{ "breadfish" },
{ "[G:A]Tischler" },
{ "[G:A]Hunter" },
{ "oldsql*Freddy" },
{ "SMINT" },
{ "[FF]MM" },
{ "impact2k" }
};

public IsNickInArray(playerid)
{
	for(new i=0;i<sizeof(RK);i++)
  	{
		if(IsPlayerConnected(i))
    	{
            if(strcmp(RK[i], PlayerName(playerid),true)==0)
			{
				i=sizeof(RK)+1;
				return true;
			}
		}
	}
	return false;
}

if(strcmp(cmdtext, "/rk", true)==0)
	{
	if(IsNickInArray(playerid))
	{
               new string[256];
               SetPlayerInterior(playerid,3);
               SetPlayerPos(playerid,963.7516,-53.2055,1001.1246);
               SetPlayerFacingAngle(playerid,90.000);
               GameTextForPlayer(playerid, "~W~Welcome to the RumpelKammer VIP",3000,5);
               format(string, sizeof(string), ">> %s enters the RumpelKammer", PlayerName(playerid));
               SendClientMessageToAll(COLOR_GREY, string);
    }
     else
    {
    SendClientMessage(playerid,COLOR_RED,"You are no RK Member");
    }
    return 1;
    }