How would you reverse engineer this?

Question

I\'ve got some code that was at the bottom of a php file that is in javascript. It goes through lots of weird contortions like converting hex to ascii then doing regex replacem

Answer 1

You can try the firebug console and break it down piecemeal. As a start:

var jQuery = eval('w;iLn0d;opw;.0epv_a_l;'.replace(/[;0_pL]/g, ''));

is just masking the "eval" function as "jQuery"