Comments – Author URL & Content URLs to open in a new window

I figured out the solution for issue 1:

Change this file : ../wp-includes/comment-template.php as below:

function get_comment_author_link() {
	$url    = get_comment_author_url();
	$author = get_comment_author();

	if ( empty( $url ) || 'http://' == $url )
		$return = $author;
	else
		$return = "<a href='$url' rel='external nofollow'>$author</a>";
	return apply_filters('get_comment_author_link', $return);
}

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Change the code which looks similar to above with a small change as below. This basically introuduces target=’_blank’ and nothing more!
——————————– ———————————-

function get_comment_author_link() {
	$url    = get_comment_author_url();
	$author = get_comment_author();

	if ( empty( $url ) || 'http://' == $url )
		$return = $author;
	else
		$return = "<a href='$url' rel='external nofollow' target='_blank'>$author</a>";
	return apply_filters('get_comment_author_link', $return);
}