shipping problem

[Cashster]

I am using the nopcart still and I have a product with a small and large size and red and green. I have both sizes and colors in a dropdown menu and a customer can choose either one and it goes to the cart no problem. I also am using the additionalinfo code in my head section and I want to put specific shipping for the large and small and for some reason it wont let me do that. When I place a shipping price in the head section of the code, now it wont even go to the shopping cart. I know I am missing something very small, but I cant figure out what it is...

UPDATE:
I now can get it to go to the cart but it only uses the $60 shipping amount and not the $30.

When you have time, could u look at my code and tell me what I am doing wrong?
http://www.lighthousepeddler.com/buoystest.html