Форумы / Cotonti / Support / Alphabetically classifying tags ??

I need a hack/modification that classify the tag cloud into alphabetical list from their ifrst letters. i might not be able to explain, so i want smt like this,

A
abacus adium alien arcadium ......

B
bear beer bing bung
C
Camel cartoon cax
D
dremel detox
...
...
...

what i want from the index_tags tag is to seperate the tags by their first letters.

http://www.chtlj.org/tags#tags something like that.

could show me a way to do this?