May be I misunderstand yr meaning. Let me introduce my situration.
> Home (URL=http://abc.com)
>Top 5 Topics (URL=http://abc.com/topic5/)
Top 5 Topics is a page and under forum tab. If I directly go to Top 5 Topics, Forum tab should be selected. As a result http://abc.com/topic5/
is not equal to http://abc.com/forum/
. How could I select Forum in this case if user goes to top 5 topics?