[Zope] Pass Variable to ZSQL from HTML page REQUEST object.

Hi, I have a html page with the following dtml tag: <dtml-in get_names> <dtml-var NAME></a> <BR> </dtml-in> When the page loads it calls the zsql that returns NAME and JOB. So I can access these from the request object, as above. However, how would I pass a variable to the zSQL? The value of the variable I want to pass is stored in the request object when the page loads. I have looked in the book but this is not explained? In the example above, I would wish to pass a vaiable to the get_names SQL? Any help appreciated, Rob