Error while passing parameters as path

All, I read the article by John Coggeshall on building search engine friendly pages. Now, I trying to pass my script parameters as path (instead of "?param=value&param2=value2"). However, for some reason I keep on getting the following error: Fatal error: Unable to open /home/mydomain/public_html/try.phtml/param1/123 in - on line 0 No input file specified. This is what I run: http://www.mydomain.com/try.phtml/param1/123 It seems like PHP is trying to read the file 123 at the given path. For some reason, PHP doesn't realize the try.phtml is the script. I am trying this with PHP3. However, my production server is running PHP4 and it works there. Is this a new feature in PHP4 or do I need to build PHP3 with some configuration for this to work? Thank you in advance. -- anas mughal