shit challenge: numerics to words

Weekly Challenge: Programmatically convert any¹ string of digits, such as "1234567" to word form, "one million, two hundred thirty-four thousand, five hundred sixty-seven"

Here is mine: http://codepad.org/gyqbaKxx

Criticize my code.  I know it sucks anus.  I would like to make it better.  Submit your own versions as well.

Use whatever language you like[i]!/i]

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1. Up to 18 significant digits is fine.

>>18
You're the type of person who thinks the equally nonsensical DD/MM/YYYY is any better than MM/DD/YYYY, right?
Sensible date format (YYYY/MM/DD) user here.