simulating Stackoverflow smooth vote operation
I'm wondering how can google translator (translate.google.com) save user rate without postback, also there are similar behaviors else where (for instance in Stackoverflow) where user views no postback (everything is so fast and smooth) but there is some database interaction, for instance voting questions/answers or comments in Stackoverflow, is it Ajax? or it is just JavaScript? It is really nice, how can I implement these type of operations using VS2010,C#, ASP.NET? 

thanks
simulating Stackoverflow smooth vote operation
===

I'm wondering how can google translator (translate.google.com) save user rate without postback, also there are similar behaviors else where (for instance in Stackoverflow) where user views no postback (everything is so fast and smooth) but there is some database interaction, for instance voting questions/answers or comments in Stackoverflow, is it Ajax? or it is just JavaScript? It is really nice, how can I implement these type of operations using VS2010,C#, ASP.NET? 

thanks