[Zope] pdf on-the-fly (again)

[Alex77]

Hi,
I'm using html2pdf external ( http://zope.org/Members/mjablonski/howtoPDF) 
script to generate on-the-fly pdf. I usually add the URL /html2pdf to the 
document I want to be converted into pdf. The problem comes when I pass a 
parameter to the URL I want to convert
  (i.e. detail?param=myvalue), the corrisponding pdf URL is 
detail?param=myvalue/html2pdf , but it does not work since 
"param=myvalue/html2pdf" is evaluated as QUERY_STRING and then the html2pdf 
script is never called.
how can I force the html2pdf script to work?
thks in advance
Alex