[wirewolf]

Include the entire path url, like
http://yoursite.com/forum/clientscri...f0f5-00004.css
Don't forget, it's an email, not a web page. It's going to be read by the users email client on thier computer. There is no folder for the email to read with the css file in it on thier computer. The path to the css file has to be full. You will have to write in the whole url yourself in the commbull.php file at that line. If you store your css as files rather than in the database, I suggest saving the css file in a separate file that the email url can "see" all the time. Because, if you change one little thing in the stylesheet from the Admin panel, the reference number for the stylesheet will change, and the emails won't get the correct css file. Besides, this way you can customize the email style separately from your board.
John