How far does the presidents succession line go? (USA)?

I'm studying for the AP Gov test tomorrow and remembered this: http://en.wikipedia.org/wiki/United_States_presidential_line_of_succession So in theory, the Secretary of Defense can be our president (Janet Napolitano) after what would surely be a series of extremely unfortunate deaths. But...what... show more I'm studying for the AP Gov test tomorrow and remembered this:

http://en.wikipedia.org/wiki/United_Stat...

So in theory, the Secretary of Defense can be our president (Janet Napolitano) after what would surely be a series of extremely unfortunate deaths.

But...what happens after that? What happens if the Secretary of Defense were to die? Do we go down the line from senators or congressmen? After that? Governors? Mayors?

Just curious if there is a 'plan' written out for the succession line to the presidency that goes further then that.
Update: oops, read that wiki article wrong :o
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