[Zope] Variables...

[After Dark]

Hello... 
I am trying to assign a value to a variable, but I`m having
problems with it.
I just want to make a table with diferent colors... like the
example:

<!--#let cor="'FALSE'"--><!--#/let-->
<table>
<dtml-in "especialidade.objectValues()">
  <dtml-if "cor == 'FALSE'">  
    <!--#let cor="'TRUE'"--><!--#/let-->
    <tr bgcolor="#EEEEEE">
  <dtml-else>
    <!--#let cor="'FALSE'"--><!--#/let-->
    <tr bgcolor="#007CC3">
  </dtml-if>
</dtml-in>
</table>

How can I make this work?

Thanks.
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