Problem trying to rewrite a URL

[hoidulich]

Hi all,

 I have a problem trying to rewrite a URL.

 It should be pretty straightforward but it has been taking me hours
 searching.

 Google indexed urls containing ";", which gets escaped to %3b:

http://hoidulich.com/index.php?action=tagged%3bid=254715%3btag=vietholiday
 (the original url that works is
 http://hoidulich.com/index.php?action=tagged;id=254715;tag=vietholiday)

How can I fix it? 
Thank you very much.
Cao Tri.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,246052,246052#msg-246052