[xTURBOx]

assuming you save jailtime
erm, this might help you
cmdprision(playerid,params[])
{
//check for params "Usage: /oprision (FULLNAME) (time)"
//set the jailtime to the "time" in the player's save file
}

OnPlayerConnect(playerid)
{
if(//jailtime != 0)
{
JailPlayer(playerid)
}
return 1;
}