[Zope] thanks jonathan but problem remains.

jonathan sir , thanks for that detailed solution. but i guess my problem was simpler. i cudnt explain it properly . I've to rebuilt a login page in zope which i'd developed in asp. I'd used javascript to do wat u've mentioned in 3rd soln. but the javascript is not at all being executed in zope. This is wat i wanted : as soon as i select a district from a combobox the corresponding user list in next combobox sud appear.the data are being fetched from Mysql using the ZSQL queries. AND CAN WE ANYWAY USE JAVASCRIPT IN DTML DOCUMENTS. please tell me the soln in ZOPE.