I'm not saying that your golf challenge isn't valid, but the monestarians tend to frown upon l33t-speak, favoring clear, well written prose.

So, that being said, I thank you for not using l33t-speak for everything that didn't have to do with your challenge.

-Scott

PS. On further reflection, this challenge isn't particularly golfable because most of the code is going to be a giant translation table. If, on the other hand, you supplied said translation table, and the challenge was to golf a solution that used the translation table to convert input, and it had to automatically detect which direction to translate, you might get some takers on that...

Update: Ack! You deleted your challenge, now my reply makes no sense. For future reference, it is much better to add 'Updates' and use 'strike' tags to visually remove content while leaving it there for future readers to enjoy.