[Zope] passing variable to dtml method -> sqlmethod

Greetings. I have a Z SQL Method that calls a select statement like so: select * from chart where <dtml-sqltest link op=eq type=nb optional multiple> I am calling this from a DTML method that formats the results. I need to call the method several times on a page, passing different values for link. I can send a value from the DTML method to the SQL method, but cannot work out how to send it from the dtml page. Do I have to start writing scripts here? Help appreciated. Don