Help!!

Okay, here's the deal:

I need to make a button to put on my Dad's site to promote his book. I have no clue how to do this. Here is the URL for his book: http://www.booksamillion.com/ncom/books?id=2824698925329&isbn=0595221106

I just need to know how to put it on his site to make it easier to get to.

Here is another one: http://www.iuniverse.com/bookstore/book_detail.asp?&isbn=0-595-22110-6

Any help would be greatly appreciated.

Thank you