sum values to create total price in a form

Hi, Im'me new.

I've made something like this:

http://web.cheapnet.it/web2go/test-form.html

It is similar to what I want but it doesn't run correct if I change, for the second time, the values of the form (becouse the function sum that values another time to the total price)

How could I correct this?
Is there something ready online?

Thanks a lot

--
Giacomo

np: (Foobar is not active ;-)


.

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