if ($cat == $cat1 || $parent == $cat1) $class = 'cat1';
if ($cat == $cat2 || $parent == $cat2) $class = 'cat2';
if ($cat == $cat3 || $parent == $cat3) $class = 'cat3';
if ($cat == $cat4 || $parent == $cat4) $class = 'cat4';
if ($cat == $cat5 || $parent == $cat5) $class = 'cat5';
if ($cat == $cat6 || $parent == $cat6) $class = 'cat6';
if ($cat == $cat7 || $parent == $cat7) $class = 'cat7';