[Palindrome] Hints for Who's There (Alaska)?

[Sofiya Vasina <sofiya sonic net>]

Could I get some hints for "Who's There"?  This puzzle looks like an 
encrypted perl script, but it's not a straight encryption. 
Specifically, I'd like to find out whether the funky spacing is 
important.  And, regardless of the answer to that, try to get any hints 
on how to decrypt it.  I can recognize a few commands from their syntax 
(e.g. "#!/vwe/pqf/nvvo" on line 1 is "#!/usr/bin/perl" and "ztczb" on 
line 7 is "split"), but I can't find a pattern for the encryption.
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