The Protestant Old Testament uses the same texts as the Tanakh, but in a different order. The Catholic version adds books, known as the Apocrypha, e.g. the books of the Maccabees. Here is a good summary of the differences: http://www.wordiq.com/definition/Old_Testament.
The term Tanakh is derived by combining Torah, Nevi'im and Ketuvim (the three main books of the Jewish Bible).
This Web site divides the the text by placing each book on one page. The advantage of that scheme is ease of reading, and printing; the disadvantage is that it requires more RAM and longer download times.
This entire site was exported from an e-book stored in an Infodex Hypercard stack. The site was exported with roughly three clicks; it complies with HTML 4 and uses stylesheets. The Crunchy Pickle Software Web site contains more info (and free downloads of the Tanakh and other stacks).