XeLaTeX Malayalam typing

Sir/Madam,

I wish to typeset Malayalam using XeLaTeX. But I can't produce the CHILLU
LETTERS and the letter ZH (The second letter of the word KOZHIKODE).
Somebody let me know the characters to be typed to get the above. I am
using Emacs editor.

Thanking you,

SREEJAN S V
==============================

*District Coordinator,*
*Higher Secondary, Kozhikode*
------------------------------------------------------------
Principal & Mathematics Teacher,
Perambra Higher Secondary School,
Kozhikode, Kerala -673 525
Phone: Office 0496 2616220.
-------------------------------------------------------------
SREE, Eravattoor, Perambra,
Kozhikode, Kerala - 673 525
Ph: 0496 2614271(R)
Mob: 9447014271.
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