Talking.Ws

I am trying to convert my urls from this:

http://domain.com/cart.cgi?333

to this:

http://domain.com/333

where "333" is the item number of a product.

First I tried mod_rewrite:

RewriteRule ^cart/* cart.cgi?&$1

The page gets redirected and the browser url stays the same, but my cart.cgi script thinks that QUERY_STRING is empty.

So then I thought I'd just get the entire url using PATH_INFO and then parse it, but when I try my script thinks PATH_INFO is empty no matter what. If I turn off mod_rewrite and then type this into my browser:

[domain.com...]

my script prints the word "test" but not the url, using this code:

[red] $variable = $ENV{'PATH_INFO'};
print $variable;
print "test"; [/red]

Any ideas? Thank you very much for your help.