yes. Use .htaccess to get control of your web server.
You may also use PHP to prevent hot linking from other sites.
http://www.sitepoint.com/books/
http://www.sitepoint.com/books/phpan...2ebb8dedea92f3
Chapter 7.
Books that should be in every webdesigners bookcollection.
You may download the first chapters free.
http://www.sitepoint.com/forums/