I actually use the RT314 at my house so that I can connect all my computers through the cable modem (it also doubles as a pretty nice switch for intranet transfers). Anyway, I ran a website on one of my servers through a RT314 and I had no problems setting it up. The first thing you need to check is the port mappings (I believe the menu option is SUA Server Setup). In this option, you need to select the port you wish to forward, and the computer you wish to forward to. Simply type in the port and the INTERNAL IP address of the computer you wish to forward to. This way, any time the router receives a WWW request, it automatically forwards it to whichever computer you specified.

The other thing that could be tripping you up is the filters. By default, telnet, www, and ftp are closed, so no requests are allowed through. So, you need to go into the filters that are defined and change it to allow WWW through. If you are really feeling spirited, you can design yourself a filter set that works best for you. I personally designed an implicit deny filter set for mine, so that only the ports that I specifically define as open are let through, all others are dropped.

As for the security thing, as long as you don't allow telnet access to the router from outside your network (again this is a filter issue), then no one outside of your intranet will ever have the opportunity to try and break in. Though, you certainly want a non-trivial password, just in case you mess something up and don't realize it. The best advice I can give you is do some searches on ports, and RT314 configs, and use a web-based port scanner to check what ports are open.

Hope this help!

-Wizeman