[NaClchemistryK]

pawn Код:

new TimerCreator;
//callback
new counter = 11;
TimerCreator = SetTimer("CountDown",1000,true);

//callback not.
forward CountDown();
public CountDown()
{
    counter = counter - 1;
    if(counter == -1)
    {
        KillTimer(TimerCreator);
    }
    else GameTextForPlayer(playerid,counter,100,3);
}

EDIT: sorry, some mistake in the previous post. take this