FiberOPtics wrote me a nice script for logging in and posting to a phpBB forum. You can find it here
(note that the search brought me to a place further down the thread... you may want to scroll to the top and read from the beginning).
Now, this is for POSTING, but it logs you in, which is what you are trying to do. If you take the part that logs you in, then you can do a standard socket script to sockread the page(s) that you need. Keep in mind that everywhere that mentions by domain (kakkoiitranslations.net) will need to be changed to YOUR domain. Also, don't forget to change the login info.