sbabu@tnc.org writes:

... dtml-tree expansion lacks parameters ... .... Now it all works fine initially. When the + sign is clicked to expand a folder, the BASEURL is not passed forward to the resulting display. That causes an error. I'm now passing BASEURL as a session variable, which I think is an ugly solution. A recent extension to "dtml-tree", the attribute "urlparam", was a bit short sighted. It allows you to extend the URL's query string. But unfornately only by a constant...

I fear, if you are not prepared to patch the dtml-tree source, you must stick with your session (or cookie) solution... Dieter