yes, that fixed the error on the cart.
On the ecart_questions.php / relatedproductsforcat.php, I was playing around with it and it displays one item now, but not quite right yet. Our server was down for a while so I wasn't able to do more.
You're right on what I'm trying to do. .... trying to only show the related products for the section they are in....that is in the Cart... for each pertaining to that category.
I added the $cartID (for the first set of products (Core Support) and the 'Brakes', so I could test with that.