Software :: Firewall Script Interferring With Boot Process?

i got a script from the internet to setp a centos as an gateway server for my lan. after installing the script, every thing worked fine. and in fact it does work well but what beats me is that when ever i restart the machine, upon booting and service startup, the systems hangs on starting up networking service. since i had not experience this ever before using this script, am confused as to if the script could be the cause. below is the exact script.my distro is centos 4.6

#!/bin/bash
# Author: Muhammad Kamran Azeem ( kamran@wbitt.com This e-mail address is being protected from spambots. You need JavaScript enabled to view it )

[code]....