Open comment authors website link in a new window

When a user posts a comment on your blog, they are given the option to have their name linked to their own website by supplying the URL when they post. To make these links open in a new window:

find in wp-includes/comment-template.php (~line 148):

$return = "<a href='$url' rel='external nofollow' class='url'>$author</a>";

replace with:

$return = "<a href='$url' rel='external nofollow' class='url' target='_blank'>$author</a>";