How to set requestScope when I click a link in xPages

I have a list of categories/tags that I want to display on a webpage using xPages.

the list is working fine as you can see here att the bottom right

http://www.notessidan.se/blogg.nsf/xstart.xsp

what I want to do now is when a user click a tag I want to do a search and return that subset of documents.

the search feature is already working when you type and click search with requestScope variable, but how do I create a url that will set my requestScope when I click the tag?

I rather not add a parameter to a url, there must be another way, right?

Thanks

Thomas

http://www.notessidan.se/blogg.nsf/xstart.xsp