[Zope] include?

We're almost finished getting the new site done completely in zope using css and mySql. We have an older portion of the old site done in php thought that we don't really want to re-write. We'd like to include it in the dtml document page that has all the common elements of every page but I'm at a loss of a way to do it other than using an inline frame. Is there a dtml include that takes a url string the way the <dtml-var> tag renders the associated file? Katie