Wordpress tag cloud as multiple HTML lists

wordpress tag lists.php

<?php
$mytags = get_tags() ;
if ($mytags) {
	echo '<ul>';
	for ($x = 0; $x <= count($mytags); $x++) {
		if (($x > 0) && ($x % 3 == 0)) echo '</ul><ul>';
		echo '<li>';
		echo '<a href="' . get_tag_link($mytags[$x]->term_id) . '">' . $mytags[$x]->name . '</a>';
		echo '</li>';
	}
	echo '</ul>';
}
 ?>