Blocking access to directories?

[jzhang1013]

I want to code a block, via mod-rewrite, to block certain directories from other referrers aka having view people view my /img folder not through the site. How do I do this?

[techietim]

http://altlab.com/htaccess_tutorial.html

[jzhang1013]

but I dont want to block an image, I want to block a directory