Ok I got it. I had to go down and watch the fireworks on the space needle first.
I suppose the ubb scripts only allow their own variable called extra_css and ignore anything else. Understandable.
The extra css can also be filled in like the other gentleman says inside of the editor with plan css syntax under "EXTRA PROPERTIES". It would be sweet to clarify a document on that part. Otherwise nobody knows what Extra Properties is for and that feature gets lost in the dustbins.
Thanks for the assistance.
To clarify for anyone else that may come across this eons later. I was able to append on the style.txt file and uploaded it again like so.
'extra_css' =>
'image_header
{
background-image:url(\'http://www.site.com/threads/images/forumimages/site.gif\');
background-repeat:no-repeat;
width: 360px;
height: 130px;
}',
