musical transposition in javascript

I'm trying to make a transposer in JavaScript..
Give it a key and a scale/mode and it will generate it for you
For instance
C Lydian (WWWHWWH) is C D E F# G A B
C Aeolian (WHWWHWW) is C D Eb F G Ab Bb
I cannot for the life of me figure out how to accomplish this.
Thoughts?
>inb4 SICP

>>23
Put it this way. It was intended to be pseudocode, the fact that it looked like javascript was partially coincidence and partially because >>1 wants it like that. Also >>20 was taking your piss, as they say, because you called me a "web programmer" even though javascript is far from my favourite language. So I went the other way. Thanks, by the way, because this is now entirely devoid of humour.