CB

As reported by kronky here:
http://www.joomlapolis.com/forum/147-potential-bug/154181-cblogin-module-fail-w3c-validation

line 709-710 of cb_login.php should be

echo '<form action="'.$loginPost.'" method="post" id="' . $idFormLogin . '" class="cbLoginForm"';
    echo ' style="margin:0px;">'."\n";

Instead of

echo '<form action="'.$loginPost.'" method="post" id="' . $idFormLogin . '" class="cbLoginForm"';
    echo 'style="margin:0px;">'."\n";