Is it possible to filter products by manufacturer in the querystring? We have the following setup :

Category : Watches

Sub Category: Mens Watches

We have say 10 different mens watches manufacturers ...

But we also have sub category Womens Watches, that has the same list of manufacturers ...

So, ideally, I want to have one store page, and then configure my site menus to point to this url, with a filter in the querystring, like ?categoryid=2 which would show say all womens watches, or a filter like ?manufacturerid=4, which would show all TAG HEUER watches ... or even a combination such as ?categoryid=2&manufacturerid=4 which would list all womens TAG HEUER watches ...

Is this possible at all?