[Zope] parameter passing syntax

[prabuddha ray]

Thanks fo rthe support
In my dtml document the DTML-IN tag used to fill the data in my 
2nd combobox in my form i'm using a ZSQL method with one param 
districtname. this value i've to get from the submit of the same 
form upon selecting from 1st combobox 'districtname'.

the  dtml-in tag i used goes like this:
<dtml-in getDistrictUser
(districtname=REQUEST.form.districtname)>
<dtml-var username>
</dtml-in>

error on saving changes:

document template parse error,

invalid attribute name getDistrictUser(districtname
for tag "<dtml-in...."


both the parameter name n the first combobox name is
"districtname" . i made them
similar thinking it wud take the request variable automatically.

plz help me out sir.