Adding CLASS to external url without modifying php files

[LICryptkeeper]

Hi, I don't post much unless i have absolutly not found the answer to the question.

I would like external links in posts to have an extra css class. I tried adding it after the colors in the body area (in css styles) in hopes it would just get added, but it didnt.

I saw where to add it in the functions_bbcode, but i do not want to edit the file.

end result: linking to my site in a post would result in <a href="http:/www.mysite.com" target="_blank">

and i want it to be: <a href="http:/www.mysite.com" target="_blank" class="myclass>