[iWD]

I have figured out where the colour is (and changed the colour) but, I need it to differ throughout the site.
This where I run into trouble.

On the cart the background is white (and has the image currently, I need it white only).
On the rest of the site it is white with a grey bar on the right (behind the menus) I have added this as a tiled image for the background. Currently it is everywhere!

But that means, somewhere I need to tell x-cart that "hey, this is a cart page, no image, just white!" and "hey this is not a cart page, load the image". Or something to that effect.
I would normally just make two sets of css and point half the page to one and half the pages to the other. But, I'm not sure how to apply this method in x-cart. If it's something labour intensive, AKA go through every page and tell it just that, I will do it. However, I'm sure there is an easier way. And I have no idea where to tell it just that!
And it needs to be all page that lack the menus on the right, which is the cart onto the finishing of the sale. Otherwise the grey bar sits in an odd spot. So I'm hoping that x-cart also can determine those pages as well.

While I can change ALL the site to one (white) or the other (images with white and grey bar), I need both.
Any thoughts?

Thanks!