I have been looking for the script,they used for 100 years ago, and found this page,where it all is.

When you take colonne 4-picture 4-Lanna thai:

The letters/script in the left colonne, is old thai script-the upper one,is normaly thai script,and the one belowe,is Lanna thai script-written 100 years ago.

The right colonne,-upper is normaly thai script,and the one belowe is Lanna script today.

https://www.google.co.th/search?q=thai+alphabet&hl=da&prmd=imvnsa&tbm=isch&tbo=u&source=univ&sa=X&ei=tz0RUL2pLYXzrQfLqIHAAQ&ved=0CE4QsAQ&biw=1280&bih=596#q=thai+alphabet&hl=da&sa=X&tbm=isch&prmd=imvnsa&fp=1&biw=1067&bih=497&cad=b&sei=6z4RUNvqGYrTrQff8YHAAQ&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&sei=P0URUOOYD8fwrQeUxIDwCA

Thank you Brian!

Now I understand more why I have problem to learn Thai language.

Looking at this table:

I have most problem with Plosive combined with Alveolar, also with Fricative combined with Glottal.

I suppose VF knows everything about this, even the combination Affricate with Alvelopalatal (that IS a tricky one!)

Looking forward to learn how other members in this forum can handle the Phonetic part of the Thai langiuage!

Maby this could be interresting to:

http://www.laomanuscripts.net/en/resources/langscripts#4