languages compatibility of a website

Hi Friends Good Morning 

I have a small doubt i want to develop a website with language compatibility

for example 

see the fallowing site

http://www.basarkammasangam.com/index.aspx

in this site on the right side top 

when we click on English  all the content will be  in English

when we click on Telugu all the content will be  in Telugu

how can we can do in the same Manner.

Please give me guidance

Thanks For Advance.....

Regards
P.Vinay Kumar