RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://199.2.127.23/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^cache:http://199.2.127.23/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://ult-tex.net/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^cache:http://ult-tex.net/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.ult-tex.net/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^cache:http://www.ult-tex.net/.*$ [NC]
RewriteRule .*\.(gif|GIF|jpg|JPG|png|PNG|swf|SWF)$ http://ult-tex.net/block.gif [R]