There is a serious error on your page. You are creating the ul with class "menu" for every list item! Sample:
HTML Code:
<ul class="thumbs">
<li>
<a href="http://www.aebn.com" class="thumb"><img src="images/thumbs/01.jpg" alt="thumbnail"/></a> </li>
<ul class="thumbs">
<li>
<a href="http://www.aebn.com" class="thumb"><img src="images/thumbs/01.jpg" alt="thumbnail"/></a> </li>
<ul class="thumbs">
<li>
<a href="http://www.aebn.com" class="thumb"><img src="images/thumbs/01.jpg" alt="thumbnail"/></a> </li>
etc.
I'm guessing you're generating that from a loop in PHP? Looks like you put the opening <ul> tag inside the loop instead of before it.
Try and explain what you mean by this: "On the left side I have a menu where I would like a black background behind and move the menu tabs some to the middle"
That is incomprehensible. Also, in Firefox the layout looks just like it does in the image, except that the right sidebar is not there.
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