How to force a comon list of products onto the page

I have a template that shows a product (ex.:ProductID = 3535)

In that ONE template i also want to show a list of products from a variable GroupID that i can construct via ProductID + "Sub" eg. 3525Sub.

I would then expect to have TWO Forms on that page.

One for the Product and one for the ProductList.

I would also expect to have some kind of javascript provoking the Productlist in the second form.

Is my reasoning correct ?

And can it at all be done ?

And if possible, how would that Javascript look ?

/Lars

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