passthru and GET parameters

Hi all, I am trying to use htmldoc with passthru function : passthru("htmldoc -t html --quiet --jpeg --webpage --footer --bottom 0.2cm --left 1.78cm --right 1cm --top 0.2cm '' $options $filename"); where $filename is urls, it works fine but not with GET pamameters : if $filename is like 'http://host/file.php?PHPSESSID=**************&value=1', passthru is waiting for the command. I think the trouble comes from the char '&', I have the same result on command line except if I use quote for the filename. And when I watch the process created by apache, the command is send without quote or quotation mark even if I put some in the filename. How can I do ? Thanks Nicolas