Java is probably too clunky. Most of us use PHP for our sites, which also means learning HTML (with style sheets, although a lot of old comics still use frames). I know that 8-bit Theatre uses
http://cusp.sourceforge.net/ which is a open source PHP program for web comics. The version I looked at a few months ago used frames. Still, with no background in PHP, I actually found it easier to build my own code than trying to figure out how CUSP had set up their program.
Getting the html code for any web page is easy (View > Source), and if you save the page to your harddrive, you'll get the code, most of the images, and the style sheet for the page. Since the php code is run on the server and sends out html code, I don't know of any easy way of getting it short of asking the author.
And speaking of which, my email address is in my profile if you want the PHP code for my main page, archive page, and archive calendar. Just send me a note, and I'll send them to you. Be warned that the code is not cleaned up and documented for other users right now. For example, the variables for the archive page and archive calendar don't match even when the variables do the same thing. They work alright, it's just that I wrote them seperately and haven't gotten around to tightening the code.
Finally, since PHP is a server side language, you'll either have to have to store them on a server or turn your computer into a server to get them to run instead of just looking at them. Luckily, there are programs you can download for free to do that. Apache turns your computer into a server even if its by itself
http://httpd.apache.org/ You'll need the PHP compiler to actually run PHP
http://www.php.net And a database to store bits of information also comes in handy
http://www.mysql.com Of course, hitting the bookstore turns up things like "SAMS Teach Yourself PHP, MySQL, and Apache" which comes with a CD with versions of those programs on them.
Gives you a starting point anyway. It's not an impossible climb to learn enough to do what you want, but even with someone elses code, its not quite a drag and drop process either.