A special wp_list_categories()

<?php$list_cats = wp_list_categories('echo=0');$list_cats = explode("\n", $list_cats);foreach($list_cats as $line) {	if( strpos($line, '<ul ') )		$halt = true;	if( strpos($line, '</ul>') )		$halt = false;	if( strpos($line, 'class="cat-item') && $halt == false ) {		$class = ($class == '-odd') ? '' : '-odd';		$line = preg_replace('/class="cat-item/', 'class="cat-item' . $class, $line);	}	echo $line . "\n";}?>