automatic speed

[IsabelaFernandez]

Hi everyone. I would like a script for GM (Game Master) group 99 as soon as it automatically logs in using the command @speed 0
without having to manually type 

[sader1992]

-	script	GM_AUTO_SPEED	-1,{
OnPCLoginEvent:
	if(getgroupid() == 99){
		atcommand "@speed 0";
	}
end;
}