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$echo = '<ul>' . "n";

$childcats = get_categories('child_of=' . $cat . '&hide_empty=1');

foreach ($childcats as $childcat) {

    if (1 == $childcat->category_parent) {

        $echo .= "t" . '<li><a href="' . get_category_link($childcat->cat_ID).'" title="' . $childcat->category_description . '">';

        $echo .= $childcat->cat_name . '</a>';

        $echo .= '</li>' . "n";

    }

}

$echo .= '</ul>' . "n";

echo $echo;