mod_expires alternative for image expiring...

Having moved to a new (Apache) server, it no longer has mod_expires
compiled in so I can't use code like the following in .htaccess to ensure
images are cached for specific periods:

ExpiresActive On
### Expire .gif's 1 month from when they're accessed
ExpiresByType image/gif A2592000

I'm just wondering what alternative methods are available. Lots of
information returned by Google went over my head, but did leave me
wondering whether mod_perl (which is available) may be of some use.

(Also, is it possible to list the available Apache modules when you don't
have shell access? Using Perl, PHP, whatever.)
--
Subtext Whore

"Where there is a perpetual fast there are very few crumbs
on the floor." - Henry James, The Aspern Papers (1888)