Have you checked out any clients? If you have Windows I'd suggest Semagic (http://community.livejournal.com/ljwin32_sema/). Its one of the clients that you can DL. I love it, just click a button and it does the codes for you ie codes for: a LJ cut, end LJ cut & Lj cut with text. Also bold/italic/underlined/strike out... creates links like I did here, it just makes posting so much easier.
Read more here: downloading a client (http://www.livejournal.com/download/)
no subject
Read more here: downloading a client (http://www.livejournal.com/download/)