[Libra_PL]

Add in top of script:

Code:

new afkmsg[MAX_PLAYERS]

In /goafk command add:

Code:

afkmsg[playerid] = 1;

In /back command add:

Code:

afkmsg[playerid] = 0;

In OnPlayerText add:

Code:

if(afkmsg[playerid != 0) return SendClientMessage(playerid,0xFF0000FF,"You must to type /back before talking!");

Not sure, not tested.