customize shopping cart in oscommerce

I have a product with different attributes . like My product is computer and it has 1 GB Ram, 2 GB Ram and 4 GB Ram. I want that if user click at 1 Gb then this should be add to cart with 1 GB attribute with its price and if user click at 2 GB Ra开发者_Python百科m then this should be Replace with 1 GB and its price. Every Attribute should be linked like add to cart.

At this time with Os-commerce button add to cart this add all attributes in cart. Any one can help that how this can be possible.

like one attribute display follow

2 GB RAM 2 X 1 GB Ram

PC2700 NONECC UNBUFFERED 184 PIN DDR DIMM KR. '`

&opt_id=&opt_val=''" />

this is not doing any action please help

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try this contribution.

http://www.oscommerce.com/community/contributions,3610