[Zope] calling a function with arguments?

I want to call a function I have made, with arguments. 1) is there any way to call it direct, complete with module name? It would mean getting Zope to import that module. 2) I know I can put it in an external metod and use <!--var mymethod--> but it needs arguments, so I'll need to set and re-set the same DTML-namespace variable throughout the document, in which case, how do I alter/set DTML varibles from within DTML? --- Julian Morrison Programmer (Zereau Ltd)