Create the virtual domain: images.deskthority.net (simply i.) and point it to /styles/deskthority_base/theme/images/ (and possibly one for /images/ )
then in the apache configuration for the virtual domain add:
Code: Select all
AllowOverride None
Header unset ETag
FileETag None
ExpiresActive On
ExpiresDefault "access plus 1 year"
Even better you could make a virtual domain for /styles/deskthority_base/theme/ (and also load JS, CSS from a pseudo-cdn) but in that case you probably need selective Expires directives.