Color-background around text and not in the whole line is possible through span into h1.
It implies changes in code as
if ($id and $backlinks) {
$result .= $q->h1('<span class=header>' . &GetBackLinksSearchLink($id) . '</span>');
} else {
$result .= $q->h1('<span class=header>' . $title . '</span>');
}
but is pretty interesting for design. --JuanmaMP