[Zope] Namespace ?

[Brenton Bills]

Hi people,
	I am new to zope and am having a few problems in regard to
namespaces (I think).

I am using code similar to the following but I get,
	Error Type: KeyError,
	Error value: unique.

I have created a dtml method with the following code...

<dtml-let unique="whrandom.random()">

<dtml-in InsertIntoDB>
</dtml-in>

</dtml-let>

I have a mysql database and the insert statement InsertIntoDB as follows,

insert into randoms
(
   <dtml-var unique>
)

I have had a look at the howtos but it still makes it as clear as mud.