[Zope] dtml-if problem

Hello, I have a little problem, but I don't find the solution for it. Here is the code: ----- <form name='ware'> <select name="warez" onChange="document.ware.submit()"> <dtml-if warez> <dtml-in wares> <dtml-if expr="id == warez"> <OPTION VALUE=<dtml-var id> DEFAULT><dtml-var sname> <dtml-else> <OPTION VALUE=<dtml-var id>><dtml-var sname> </dtml-if> </dtml-in> <dtml-else> <dtml-in wares> <OPTION VALUE=<dtml-var id>><dtml-var sname> </dtml-in> </dtml-if> </select> </form> ----- But the <dtml-if expr="id == warez"> is never true. Why it is possible? Thanks for your help. -- Amon Tamas sajt@amon.hu