VirtualHost, ScriptAlias, AddHandler, and relative URLs..

I have a virtual host set up, I've used ScriptAlias and AddHandler to
get it to run my main script for any request sent to the virtual host.
(I ScriptAlias'd / to my .fcgi script)  My main script then looks at the
request information, and routes the request to a handler in a module, or
maps it to a static file, etc.  But I have a problem:  Within my script,
how do I tell if a request is relative?  The REQUEST_URI always has a
leading /, whether the url requested by the page has one in it or not.
The HTTP_REFERER is the same either way as well.  In fact, everything is
the same either way, so far as I can see.  Is there any way to tell?  

If the page returned when http://my.host.com/moduleA is requested asks
for css/mystyles.css, the request uri is /css/mystyles.css.  (It puts in
a leading slash whether url the page asked for has one or not.)  The
thing is, I want to map /css/mystyles.css to /myhost/htdocs/css/mystles,
not to /myhost/moduleA/htdocs/css/styles.  But I want to map
css/mystles.css to the later.  But I have no way to tell which of the
two was requested.

Any help?

Roger

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