Thai-xtis fontset

Hi all,

   Does anyone know how to display thai language in xemacs?  I have xemacs 
21.4 (patch 14) installed on my machine.  When I issue command
"M-x describe-language-environment " and select "Thai-XTIS". Xemacs show 
message as follow

begin message.
==================================
  Thai-XTIS language environment

Sample text:
  ~

Input methods:

Character sets:
  thai-xtis: Precomposed Thai (XTIS by Virach).

Coding systems:
  tis-620 (`TIS620' in mode line):
	external=tis620, internal=thai-xtis
  iso-2022-7bit (`ISO7' in mode line):
	ISO 2022 based 7-bit encoding using only G0
================================
end message.

And there is one warning message.

===================
(2) (font/warning) Unable to instantiate font for face zmacs-region, charset 
thai-xtis
===================

I think I have to install Thai-XTIS font but I cannot find it anywhere on 
the Web.
Could anyone please give me any hint? I will be really really appreciate.
I am struct because of this problem for one week now. And I try a lot to 
search from the Web. If I know how to do this, I'll definitely post the 
solution on the Web

Thank you very much,
Teerawat

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