by Angus Turnbull, http://www.twinhelix.com, updated 14 Nov 2001.
1337 n.: The practise of obfuscating text by replacing letters with numbers and various other tricks, in an effort to prove one is an 'elite hacker', or '31337 h4x0r'. Often referred to as '1337sp34k'.
So, I coded this up to even the scales -- a leet decrypter ('de1337er' ;). Note that the main point of this script is 'de1337ing' obfuscated text to make it readable by normal users. Converting to leet is not perfect as global RegExp replacements are used, and should only be used for testing purposes.