PHPSESSID and URL rewriting

Hi everyone, I have this situation: I use some regular expressions to rewrite the URL of a web site, in particular: http://www.mysite.com/lingua-ita/colore-rosso/pagina.html that becames http://www.mysite.com/pagina.php?lingua=ita&colore=rosso. Is all ok until I use some session variables. It happens that the string ?PHPSESSID=[valore] is merge to the link and this will cause a damage in the URL rewriting. Note that the string comes merged by the browser (Explorer, opera) to the link I wrote before. (http://www.mysite.com/lingua-ita/colore-rosso/pagina.html?PHPSESSID=f4s6f5d4fs65df4s65fd4). Since the links first come in this format, then are rewroted by the rule in the file htaccess and finally parsed by the webserver (apache , IIS), How can I avoid it? I tried with: RewriteRule (.*)?PHPSESSID=(.*) /PHPSESSID-$2/$1 as last rule, but it didn't work. Can you help me? thanks in advance Seba