What type of mount does my Nikon have?

I thought all nikons have the same mounts. I have a Nikon D3000, what type of mount does it have? The reason why I'm asking is because I'm looking for a lomography diana lens.

http://www.amazon.com/...002SSU4B2/

will that lens in the link fit my D3000, and I understand it's cheap but I just want to test the lens out before I start spending more coin… What would you guys recommend?

Nikkor lenses made since 1959 use F-mounts.

The metering coupling has gone from a mechanically coupled meter, to "AI" auto-indexing, followed by AF (auto-focus), AF-I (auto-focus internal focusing) to the newest and fastest auto-focusing lenses, the AF-S. Your camera uses the AF-S and AF-I lenses in the auto-focus mode and can use AF lenses if you don't mind manually focusing those lenses.

Here is all you need to know about Nikon lens mounts

http://www.kenrockwell.com/...y-lens.htm

Your camera needs lenses that have electronic connectors, so this little adapter for using LOMO lenses will NOT work on your camera. You will need at least a Nikon D200 or better camera to use those toy lenses

The link is not to a lense but to an adapter that allows you to fit lenses. You would have to buy the lenses featured at the bottom of that link.
You also need to bear in mind that those Diana 'beer bottle end' lenses are as described for a 6cm x 6cm negative format. 20mm is a fisheye on 120 film sq.format but it is just quite wide on a 35mm negative and could even be slightly long focus on a small sensor. Many 35mm cameras have lenses wider than 38mm fitted as standard.
If you seriously want to take very poor photos with your quality Nikon, you could buy some very cheap old Nikon fit lenses on eBay and just damage them! Hammer the front element enough to crack it, clean the lense edges with glass paper, see if you can dismantle it enough to move some of the internal elements a little. I've just sold a simple T2 mount 35mm lense with a Nikon adaptor for $10. That as sold was far too good for Diana fans but creatively damaged it could be almost as bad as a Diana lense.

What type of mount does my D-90 have?