how i update xslt file?

See more:

C#

ASP

XSLT

menu

Hi all,
I making an menu for products total with xslt file similar to addressURL http://aspalliance.com/822_Building_a_Database_Driven_Hierarchical_Menu_using_ASPNET_20[^]
when I can update xslt context with click on the one item of the menu that his result is display menu items correlate with selected item?
to instance when I click on the tea item sub group drink instead of indicated products total menu in the after page just indicated items that them ParentID column with tea ParentID column equal.
in other words in the after page indicate drink group items.
thanks