[Zope] title and dtml-let

Currently, I have a customized standard html header, and would like to be able to use the same header for all files, but have different titles for each...I have tried using this in my header: <title><dtml-let var="'TITLE'"></dtml-let></title> and then using this in the individual file: <dtml-let var="'TITLE'" value="'My title'""> </dtml-let> I only use the "'....'"...becuase otherwise, I get syntax errors.....however, when I look at the source code on the page, it reads <title></title>...so apparently this is not working. Any suggestions? Thanks, Jessica Tishmack