Mountain Biking - New to disk brakes, just found out the fork I'm ordering isn't compatible...

I just noticed the Marzocchi DJ2 (http://www.blueskycycling.com/product5976_39_-2010-Marzocchi-Dirt-Jumper-2-Fork.htm) I'm about to order had a funny looking brake mount. Being new to disk brakes, I had no idea they had different types of mounts. Now I'm looking into this and wondering what my best route is to deal with the situation and hoping I could get a little input from you all who know way more about this than I. Are there just the two standard kinds of mounts, or do I need to worry about it further than that? I did see that there are some adapters on the website I'm ordering the fork from that I could order with the fork, but I want to make sure I'm not overlooking something and order a part that won't help me out at all. That seems to be the cheaper way to go and I can't afford to get new brakes to go along with this fork right now.

I need use my Tektro caliper on the Marzocchi fork that looks like it takes a 6" PM brake caliper. The Tektro is the kind where the bolts go in from the side of the caliper rather than from the back (Looks like that's called IS?).

Fork with 6" Post Mounts (some forks have 7" Post Mounts and you can't use a 6" rotor) + Post Mount brake + 6" rotor = no adapter needed, the brake will bolt straight onto the fork.

Photo (http://farm5.static.flickr.com/4025/4465515491_0fc6de149b_z.jpg?zz=1) of a PM fork with a PM brake.
Photo (http://www.jejamescycles.co.uk/product-images-large/avid-juicy-carbon-disc-brake-33753.jpg) of a IS fork with a PM brake & adapter.

The fork in question has the 6" Post mounts.
http://www.marzocchi.com/template/detailProdotti.asp?LN=UK&idIU=2464&idC=1718&IdFolder=113&idMY=56695&uf=IU&IdOggetto=56816

Sorry. I might not have worded my post clearly. The fork is PM, but my caliper is IS. I need an adapter to put an IS caliper on a PM fork.

My mistake, I misread your post.

160mm adapter
http://clee-cycles.co.uk/esite/P1043/product

180mm adapters
http://www.starbike.com/php/product_info.php?lang=en&pid=13518
http://www.chainreactioncycles.com/Models.aspx?ModelID=13735
http://clee-cycles.co.uk/esite/P1044/product
http://www.wiggle.co.uk/a2z-adapter-pm-to-is/

* Not all IS mount brakes have enough clearance to be used with the 160mm adapter, some brakes can only be used with the 180mm adapters.
* I've seen photos where the 160mm adapter didn't have enough clearance to fit on a Post Mount fork. A fork with large diameter lowers will have shorter Post Mounts then a fork with smaller diameter lowers and the position of the fork ends / dropouts in relation to the lowers can also affect the length of the Post Mounts.

Sorry. I might not have worded my post clearly. The fork is PM, but my caliper is IS. I need an adapter to put an IS caliper on a PM fork.I don't see a single Tektro disc brake in their lineup that is only IS mount. Unbolt the caliper from its IS adapter and you now have post mount.

Just went and double checked the caliper. There is no adapter on it and it's IS mount. It is ~4yrs old, so I guess it's probably not the same as their current/recent product line.

I don't see a single Tektro disc brake in their lineup that is only IS mount.
The Tektro Novela was made in a IS mount version.

http://blogimg.goo.ne.jp/user_image/5d/eb/72d86ae9534b5f7d7fb54e78c46a6cdd.jpg

^ That's what I have. I know it's not a great caliper, but right now I'm not even on a bike until I get the new fork and I don't have the funds to buy a nice set of disk brakes right now. I plan to buy some nice PM brakes sometime this winter but for now...

Thanks for all your help.

^^ Oh, crap. Sorry my searching did turn up an image of one or two that I figured had to be earlier versions (one even looked a ringer for an old set of RST brakes I had) that were IS only but I thought "what are the chances?" And, well . . . .

Haha, no biggie. Those stupid chances will get you every time if they can... Thanks for looking into it and trying to help.