This is called directed advertising,the advertisers will use cookies, and embedded scripts in their links to get some information from your browser, Like IP address, country, city ,etc.. .,afterwards, the content is displayed depending on the user's location, since some information will be disclosed during surfing , you can see what information is revealed here
I have once seen Chinese content when I was using a proxy located in china for testing purposes :)
please post back for any further clarification.





by: LucFPosted on 2009-04-20 at 12:48:51ID: 24187990
Hello Spankenstein,
Locator.ht m or http://www.ipaddresslocati on.org/
That'd be IP-range specific.
It's pretty easy to locate an IP to a pretty specific area, for example you might want to check http://www.geobytes.com/ip
Ran ges can easely be implemented in advertizement scripts, using or not using a pop-up for displaying it.
Reg ards,
LucF