2-char codes for 'obscure' languages

If you speak anything other than English, I need your help!!

Standard 2-char codes for languages are USUALLY well defined, e.g. the following list gives a supposedly definitive list:

http://www.loc.gov/standards/iso639-2/langcodes.html

Supposedly.

I have a particular need to find out the best 2-char codes for many languages which it seems are NOT listed there!

The codes are to be used in the following site URLs, e.g. for French language, the 2-char code 'fr' is shown below:

Edit (Moderator): Link removed. Do not post your link.

The list of ALL the languages being used can be found at the bottom of the home page:

Edit (Moderator): Link removed. Do not post your link.

and the list of languages comes from:

http://www.dmoz.org/World/

There are a few problems:
a) The DMOZ site list defines the language in the language (e.g. Spanish is listed as Espanol), whereas the ISO-639 list has the language listed under its English name. Sometimes I just don't know what goes with what!

b) Sometimes DMOZ lists a language that just doesn't seem to appear at all in the ISO-639 list

So, PLEASE, if you speak a particular language listed there, check what the 2-char code used on Edit (Moderator): Link removed. Do not post your link. and see if it is correct!

In particular, I have no clue and have had to guess what 2-char code to use for:
Bable
Bahasa Melayu
Bangla
Bosanski
Chinese (DMOZ lists 2 versions - simplified and traditional - which should use the ISO code of zh? and what should the other use?)
Eesti
Euskara
Frysk
Letzebuergesch
Lietuviu
Magyar
Punjabi
Rumantsch
Shqip
Srpski
Suomi
Taiwanese

Thanks for any help/suggestions/corrections!

regards,


The linguistically-challenged webmaster