Login Protected Webpage Downloader

[Thrall]

Hello everyone, I'm looking for a way to download an online guide (html format) that I registered for that requires a username and password to access. I've tried a few different webpage downloaders and firefox add-ons, but they all end up just giving me a bunch of copies of the log-in page for the website. I could go to each page and manually save it, but there are about 30 links and I won't have them linked to each other within the webpage's menu. Do you guys know of any program that will let me log into the website first before I download all of the webpages? Thank you for your help!