Combine CSS and form background

I am trying to have a bacground image on a form in the Notes client, were the image is an image resource. The image is calculated using @If( Status=0 ; “Draft.gif” ; “” ).

However, when entering this formula in the form properties as a background resource, all CSS formatting of the tables in the form disappears (the same happens using the image resource without any formula).

Any ideas how I can have a calculated image background combined with CSS ?