chklines()
{
    chkint ${1} ${2} &&
      (( ${2} >= 0 )) &&
      (( ${2} <= ${MAX_LINES} )) &&
      return 0

    ROW_NBR="24"
    COL_NBR="1"

    eval addstr \"${CMD_MOVE}\" &&
      clrtoeol &&
      addstr "${1}: Invalid line number" >&2 &&
      refresh &&
      ${ERROR_PAUSE} &&
      eval addstr \"${CMD_MOVE}\" &&
      clrtoeol &&
      refresh

    return 1
}