Modifying PHPBB3 - Modifying Joomla - Help Needed

[MrMacca]

I posted a problem I was having with an old PHPBB2 forum that was solved instantly by this very forum, so I want to throw out my next 2 questions.

I have a Forum as well as a Joomla front end which serves as the website for my World Of Warcraft guild.

Now on both websites, I would like to have the side image that is featured on the official World of Warcraft WOTLK website - http://www.wow-europe.com/wrath/index.xml

Here is the Image - Side Images

Does anyone know how I could modify the layouts of the following 2 sites:

Joomla - Main website - http://www.mrmacca.com/ascendantsofevil/
PHPBB3 - Main Forum - http://www.mrmacca.com/phpbb3/

So that rather than having the black background of the forum, it is replaced by the image shown above.

My priority is mainly for the PHPBB3 Forum to have the look, so don't worry too much about the Joomla one.

Thanks in advance to anyone that can help!!

 

[MrMacca]

Much appreciated ClearChaos. Worked like a charm. Modified both the Joomla aswell as the PHPBB3 forum.

Just out of interest would you know a way to do the following?

I want to create a link to the main website on the menu at the top of the PHPBB3 forum that links to the main website.
At the moment it just has :

User Control Panel • 0 new messages • FAQ • Search • Members • Logout

But I want it to look like:

Main AoE Site • User Control Panel • 0 new messages • FAQ • Search • Members • Logout

Can this be done?

Also, is there a way I can make the .SWF banner at the top clickable that redirects BACK to the Forums index page?

Apologies for all the questions.