Price to include shipping divided by quantity in basket

[abcooke]

Hello all,

 

This has been bugging me for some time. I have several flat shipping prices, which the customer can select from the right hand column in product information page. What I want to do is divide the selected shipping method cost by the number of items in the cart and add it to the product price.

 

Secondly this should only be done to products from a specific category.

 

I have this working on product listing and product info, but the difficulty is having oscommerce add the prices together correctly.

 

 

Any ideas on how to do this?