Can i show different content by changing the exernal link to a page

I have an email list and all the people live in different city.
Is it possible that a page has an different picture depending on the city where a person on the mailing list lives?

For exemples in the email a link looks like:

http://www.domain.com/specialreport/?x=cityname
http://www.domain.com/specialreport/?x=newyork
http://www.domain.com/specialreport/?x=orlando

On the page http://www.domain.com/specialreport/ there wil be an picture newyork.jpg or orlando.jpg

I don't want to make 500 different pages like http://www.domain.com/specialreport/newyork
http://www.domain.com/specialreport/orlando
I just want 1 page http://www.domain.com/specialreport/ that changes because of the link.