Help With IPTables shell Script

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http://nixcraft.com – I have been trying to research and understand Netfilter/IPTABLES the best that I can. I have written a shell script to start with and I would like to know if I could post it and have some opinions on it to help me get it right. Presently I have a site located on a Virtual Server with (2) two IP Addresses. I have a single IP Address (that is Dynamically Assigned although it doesn't change very often from RR) that I will want to have all ports open between my site and my hosted site. I have my VOIP Server (Asterisk) located there as well. So I would need my VOIP Ports 5060-5090; 10000-20000 (HowTos)