Hi, I have had some success with mod_rewrite but i have a problem i can't understand. I want to rewrite the following url : alpha.php/alpha/a?osCsid=1d207d6d6b214b7daf5c8ac80a14bbd1 to look like : alpha.php?alpha=a&osCsid=e84a6d2f4145bac3130c4484942f3ca0 if I ignore the osCsid parameter i can get it to rewrite using: RewriteRule ^alpha\.php/alpha/([a-z]{1})?$ alpha\.php?alpha=$1 to add osCsid param i have the rule below which leaves the url unchanged : RewriteRule ^alpha\.php/alpha/([a-z]{1})?osCsid=([^/.]+)$ alpha\.php?alpha=$1&osCsid=$2 can anyone help me attach the osCsid parameter on to the end of the url? many thanks Sane