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javascript 3 help <!--Possible Spoiler-->
This challenge is alot easier if you start by decrypting the url encoding. You can use the url decoder at the bottom of this page http://ha.ckers.org/xss.html where it says Hex Value: URL: Insert encoded string here..
Read all the code carefully and you will pass this challenge no problem.
<Edit> Just a tip on most of the javascript challenges, most can be done by alerting values stored in an important variable. </Edit>