E, shtom ti trqbva oshte edno nivo :

$ENV{HTTP_REFERER} =~ m#(http://.*?/.*?)/#;
$css_dir = $1;

Reshenieto raboti, dokato strukturata na saita ostava postoqnna, t.e.
site.com/folder1/style.css
site.com/folder2/style.css
site.com/folder3/style.css

Ako ima obache
site.com/folder1/style.css
site.com/folder1/folder2/style.css,

shte trqbva da se generira parametyr v
link-a, v zavisimost ot koito da se vzema pytq.