Opening up port 8080 in CentOS

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http://serverfault.com – I'm new to opening up ports in CentOS. I need to open up tcp port 8080 and have installed/ran nmap to find it is not open already. I've been reading about the iptables command, I have v1.3.5 installed but I really don't know where to start with it regarding opening up this port. I'd appreciate a code sample or at least a link to a guide to opening this port using iptables (or any other good method.) Thank you. (HowTos)