how to type in hindi

[Abhishek Dixit]

Hi,
I opened libreoffice 3.0 (Ubuntu 11.10) and selected Lohit Hindi font
in the fonts selection column.
Downloaded the charachter map of English and Hindi keys as given here
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/International_Language_Support_Guide/images/hindi.png
but when  I am typing in Hindi with my english keyboard there is no
Hindi word I still the english letters typed as
"kerasadsd".Which should not happen since Lohit Hindi font is selected
so I expected the correcponding key mapped Hindi characters to appear.
What mistake did I do in above?

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Regards
Abhi