Product attributes - price multiplication

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Hi,

I'm trying to add a banner product to my store.  There are several specific heights available (12",18",24",etc), but the customer can pick any length in feet they would like.  I need to be able to do something like:

12" at $5.60 per foot, 18" at $6.80 per foot, etc.  I configured one attribute field to be a dropdown of available heights.  The other I would like to be a numeric input field of length in feet.  Then when you add it to the cart, it would multiply cost per foot by length.  Right now there is only a (+) and (-) modifier on an attribute.  I'm aware of the [url=http://www.oscommerce.com/community/contributions,721]old contribution[/url] - but the code is from way back in 2002 and I couldn't get it to fit at all. I also know several people have asked in the past, but I never found a clear answer.  Any ideas?

Thanks for your help,

Joe