$thread_comments_depth .= "<option value='" . esc_attr($i) . "'";
if ( get_option('thread_comments_depth') == $i ) $thread_comments_depth .= " selected='selected'";
$thread_comments_depth .= ">$i</option>";
$thread_comments_depth .= "<option value='" . esc_attr($i) . "'";
if ( get_option('thread_comments_depth') == $i ) $thread_comments_depth .= " selected='selected'";
$thread_comments_depth .= ">$i</option>";