Better handle deltaModes  1 (scroll by lines) and 2 (scroll by pages).
offsetParent was not added until 1.2.6 and should probably continue support for 1.2.2 since this is going to be a bug fix release
can just use $ here
fix my indents
Attempt to beter handle older browsers that use a wheelDelta based on 120
again with my indents
Bump version to 3.1.7 and update my info in a few places.