No problem !
You can change the script... look this :

#!/bin/sh
while true
do
  echo "Enter parent process id  [type quit for exit]"
  read ppid

  if [ $ppid -eq "quit" -o $ppid -eq "QUIT" ];then
     exit 0
  fi

  for i in `ps -ef| awk '$3 == '$ppid' { print $2 }'`
     do
       echo killing $i
       kill $i
     done
done