Hi, I want to supply a supplementary url-parameter on a page where i use a python tree-widget. That means with every new page i open while browsing the tree this url-parameter should also be supplied. I figured out this could work using the 'urlparam' attribute of the tree-widget like the following (with my_id holding the actual id i want to supply): <dtml-tree urlparam=my_id id=nod_id assume_children="1" branches_expr="classification(nodidx=nod_id)"> Unfortunately this does not work as such, the resulting url looks liek this: http://our_host/folder/mytreepage/?my_id&tree-e=.... 'my_id' is just inserted into the url as is, instead using the variables value. Does anybody have a solution for this strange behaviour? Thanks in advance! br, Stephan