Content translation depending on the location

Hi

I have got a requirement.When a user enters into the portal through internet, i want to change the entire content of the portal depending upon the location. And also the Portal Admin Should get the location of the entered user

i.e; when a user enters from germany, the entire content of the portal should be displayed to him in German(without the user clicking any link).Here in this case the Portal Admin should get the location of the user as Germany.

It would be very helpful to me, if anyone can throw some light on this

Thanks in advance,

Regards

Rajeev.