Changing template "on-the-fly"

[Daniele Margotti]

Hi list,
I use CGI MapServer and I know that I can change "on-the-fly" parameter
values of a mapfile using "&map_VARIABLE=NEW VALUE" in the browser address.

Now, I want to change the template, and I thought I could
use "&map_web_template=/path_to_my_data/new_template.html", but...
MapServer still uses the template defined in the mapfile.

How can I do?

Thanks,
  Daniele