Open PHPMyadmin in Web browser

http://127.0.0.1/phpmyadmin/

select your database

select systempreferences table

Click on Insert

Type following in value column

variable varchar(50) GoogleIndicTransliteration

value text 1

explanation text Google Indic Transliteration

type varchar(20) YesNo

Save the value and quit from PHPMyAdmin

Open Your OPAC page in web browser (Internet connectivity is necessary for working Google Indic Transliteration

How to Add or Remove language in OPAC search

Edit your goolge indic js file:

sudo gedit /usr/share/koha/opac/htdocs/opac-tmpl/prog/en/js/googleindictransliteration.js

LanguageCode maps name constants to language codes that you can use to specify the source and destination languages in the transliteration methods.

ENGLISH: 'en',

AMHARIC: 'am',

ARABIC: 'ar',

BENGALI: 'bn',

CHINESE: 'zh',

GREEK: 'el',

GUJARATI: 'gu',

HINDI: 'hi',

KANNADA: 'kn',

MALAYALAM: 'ml',

MARATHI: 'mr',

NEPALI: 'ne',

ORIYA: 'or',

PERSIAN: 'fa',

PUNJABI: 'pa',

RUSSIAN: 'ru',

SANSKRIT: 'sa',

SINHALESE: 'si',

SERBIAN: 'sr',

TAMIL: 'ta',

TELUGU: 'te',

TIGRINYA: 'ti',

URDU: 'ur'

Transliterate API JavaScript Reference

http://code.google.com/apis/language/transliterate/v1/reference.html