PS brushs problem!.

Well, I'd like to make my own brushs in photoshop, the only thing is that I know how to make it but I don't know how to make a brush pack, you know these that contain many brushs in just one box.
the other thing is, you know that grass brush in PS 0.7?. I used to have it, but once I reseted all my brushs, it disappeared along with the other brushs in the same box as it is.
If someone knows how to do these two things I'd be gratful.
1.How to make a brush pack?.
2.How to get the grass brush back?.
Thanks in advance.