I'm using ATA 3.6.7 and WordPress 3.1.3.
To get the background image I put the following in: Overall Style & Config./Body, Text & Links/Body Style

font-family:Verdana, Arial, Helvetica, sans-serif;
font-size:10px;
line-height: 1.4;
color: #001451;
background-image: url(/images/corrigan-bentley-sales-background2.jpg);
background-repeat: repeat-x;
background-color: #a2a8be;
padding-top: 20px; padding-bottom: 20px;

and put background to everything else to transparent in all the relevant ATA menus.

My layout is 95% fluid with a 1150px min

The background image is 10px x 1500px

I tried adding a width:100% to the above CSS but that didn't help. with a normal background colour it doesnt create the scroll bar, so I must be doing something wrong in the code?

Thanks for looking

Try adding the following to your code

overflow: hidden;

Hello Larry

Thanks for your answer, although using this meant all overflow was hidden and I could therefore not scroll up and down either.
Weirdly enough, after then deleting the code, it was all working perfectly..
Unexplained, but fine by me