Help with PHP and Apache

[mark1822]

Hello,

I am trying to set up a Web site I am building so that it works like
this:

When someone goes to: www.runningback.com/reg

The "reg" get's passed into index.php as an argument and index.php is
executed.

I can pick up "reg" in index.php using $_SERVER['PATH_INFO'].

But right now what happens is the url is not recognized by Apache 1.3
and so gives me an error.

If I call www.runningback.com it calls index.php just fine, but not
when I want to pass in an augument. I'm trying to make user friendly
urls.

Does anybody know how I can configure apache so that this works the way
I want it to, and preferably through just using an .htaccess file?
Thanks
Nick Mudge