Simple script fix

I currently use the following keepalive script to watch my apache process through a crontab:

---snip---
  #!/bin/sh
   
  # this script is a watchdog to see whether the server is online
  # It tries to restart the server if it's
  # down and sends an email alert to admin
 
  # admin's email
EMAIL=webmaster@myserver.com
  # the path to your PID file
PIDFILE=/etc/httpd/logs/httpd.pid
   
  # the path to your httpd binary, including options if necessary
HTTPD=/etc/httpd/bin/httpd
       
  # check for pidfile
if [ -f $PIDFILE ] ; then
 PID=`cat $PIDFILE`
   
 if kill -0 $PID; then
 STATUS="httpd (pid $PID) running"
 RUNNING=1
else
 STATUS="httpd (pid $PID?) not running"
 RUNNING=0
fi
else
 STATUS="httpd (no pid file) not running"
 RUNNING=0
fi
     
if [ $RUNNING -eq 0 ]; then
 echo "$0 $ARG: httpd not running, trying to start"
if $HTTPD ; then
 echo "$0 $ARG: httpd started"
 mail $EMAIL -s "$0 $ARG: httpd started" </dev/null >& /dev/null
else
 echo "$0 $ARG: httpd could not be started"
 mail $EMAIL -s "$0 $ARG: httpd could not be started" </dev/null >& /dev/null
fi
fi
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Problem I have is when apache dies, it leaves some child processes, so I want to add a "killall httpd" if the particular parent httpd process the script checks for is not found.

Can anyone help me modify this script to make that happen?

Thanks!