disable right column background only on product_info

[gsdcypher]

Hi,

I have the right column on product_info disabled via tpl_main_page

if ($current_page_base == 'product_info') {
  $flag_disable_right = true;
}

But it still shows my background image for both columns in the css stylesheet.

#contentMainWrapper {
    background:url("../images/sidebox.gif") 100% 0 repeat-y; /* This is the right column background "faked" with an image. */
    background-color:#ffffff; /*background color for the main "content" of the site */
    }

What is the correct css to disable the background image only on the product_info page?

Thanks

[gsdcypher]

never mind
figured it out with a css file just for that page.

thanks!