main-rollup.css is interfering with one of my CSS ID's

[bigtime]

Hello,

I've used Firebug and Web Developer to try and track down this conflict but can't figure it out.

If I remove main-rollup.css the following css displays, otherwise it doesn't:

/* Page Back */
#pageback
{ background:url(/new2012/image/wall/01.jpg) no-repeat top center; position:absolute; left:0; top:0; width:100%; height:234px; z-index:-10; -webkit-background-size: cover; -moz-background-size: cover; -o-background-size: cover; background-size: cover;}

Here is what my header should look like with the photo of Bruce Lee controlled by #pageback:
http://defend.net/new2012/classes/

Here is what it looks like on the forum (Select new2012 style):
http://www.defend.net/deluxeforums/m...mma-bjj-forum/

Notice Bruce Lee is gone. What in main-rollup.css could possibly be interfering with #pageback?

Thanks for any pointers.

Tim