[Zope] From whence came <base>?

I have a simple site with two pages /corp/index_html /corp/sub/index_html Both are DTML documents. Both have identical html headers (as far as my eyes can tell). The sub/index_html takex GET arguments, the other does not: /corp/sub/index_html?blah=yep&foo=nope The rendered source for /corp/index_html as seen from the browser has a <BASE> tag I never requested (but really want!) The rendered source for /corp/sub/index_html does not have a <base> tag. This second fact is upsetting. I'd really like to get a <base> tag in there. Aside from manually inserting it, how can I get zope to do whatever magic it did on the first page? Charlie Reiman