Radio problem

Wie kann ich machen das nur der Fahrer /vehradio eingeben kann und dann sollen alles die im Auto sietzen hören können aber wie?

???

hir die stocks:

stock RadioForPlayer(playerid,slot)
{
switch(slot)
{
case 1:{GameTextForPlayer(playerid, "~r~ILoveRadio", 500,3);PlayAudioStreamForPlayer(playerid, "http://www.iloveradio.de/listen.m3u");return 1;}
case 2:{GameTextForPlayer(playerid, "~r~Radio Aus", 500,3);StopAudioStreamForPlayer(playerid);return 1;}
}
return 1;
}

stock RadioForAllCarPlayer(playerid)
{
new fid = GetPlayerVehicleID(playerid);
for(new s=0;s<MAX_PLAYERS;s++)
{
if(IsPlayerConnected(s) || IsPlayerInVehicle(s,fid))
{
RadioForPlayer(s,GetPVarInt(s,"Radiowahl"));
}
}
return 1;
}

hir der Befehl:

ocmd:vehradio(playerid, params[])
{
if(!IsPlayerInAnyVehicle(playerid) || GetPlayerState(playerid) != PLAYER_STATE_DRIVER)return SendClientMessage(playerid,Rot,"* Du musst in einem Fahrzeug sein und der Fahrer!");
ShowPlayerDialog(playerid,DIALOG_Radio,DIALOG_STYLE_LIST,"Radio-Sender","ILoveRadio\nRadio aus","Abspielen","Abbrechen");
return 1;
}

hir der Dialog:

if(dialogid == DIALOG_Radio)
{
if(response)
{
SetPVarInt(playerid,"Radiowahl",listitem+1);
RadioForAllCarPlayer(playerid);
return 1;
}
}

Ihr der neue Dialog:

if(dialogid == DIALOG_Radio)
{
if(response)
{
if(listitem == 0)
{
new fid = GetPlayerVehicleID(playerid);
for(new s=0;s<MAX_PLAYERS;s++)
{
if(IsPlayerConnected(s) || IsPlayerInVehicle(s,fid))
{
GameTextForPlayer(s, "~r~ILoveRadio", 500,3);
PlayAudioStreamForPlayer(s, "http://www.iloveradio.de/listen.m3u");
}
}
return 1;
}
if(listitem == 1)
{
new fid = GetPlayerVehicleID(playerid);
for(new s=0;s<MAX_PLAYERS;s++)
{
if(IsPlayerConnected(s) || IsPlayerInVehicle(s,fid))
{
GameTextForPlayer(s, "~r~Radio Aus", 500,3);
StopAudioStreamForPlayer(s);
}
}
return 1;
}
}
}