Switch between HTML and Image Legend in cgi mode

[Piero Cavalieri]

Hi all,

Mapserver let you change map file parameters via url.
I was wandering if there is a way to delete dinamically a parameter, when
in cgi mode. In partucular, I would like to delete  the TEMPLATE parameter
from the LEGEND obj, so an image legend is returned (most convenient to use
in pdf generation, but in browser interface I want HTML legend...).

Thanks
   Piero