Dijkgraaf - 10:48 pm on Jun 7, 2012 (gmt 0)

To fool most browsers not to use a cached resource you need to change the URI of the resource.
So if the frame points to something like
http://www.example.com/add.htm?publisherid=1234
get them to add a dummy parameter e.g.
http://www.example.com/add.htm?publisherid=1234&frame=1
http://www.example.com/add.htm?publisherid=1234&frame=2
This makes the URI's unique and it should then not use the cached version.

You might also want to check that you are expiring your add page immediately and setting the nocache options.