building dynamic menu problem?

[PHPycho]

Hello forums!
I am getting bit problem in displaying dynamic css menus which uses <li><ul> tags.
I had the table with structure as:
tbl_cat

¦id¦title¦parent_id¦
¦1¦Item 1¦ 0 ¦
¦2¦Item 2¦ 0 ¦
¦3¦Item 3¦ 0 ¦
¦4¦Item 4¦ 0 ¦
¦5¦Item Item 2.1¦ 2 ¦
¦6¦Item Item 2.2¦ 2 ¦
¦7¦Item Item 3.1¦ 3 ¦
¦8¦Item Item 3.2¦ 3 ¦
¦9¦Item Item 3.3¦ 3 ¦

I have to show these values as following in order to display the proper multilevel menu.
<li><a href="#">Item 1</a></li> <li><a href="#">Item 2</a> <ul> <li><a href="#">Item 2.1</a></li> <li><a href="#">Item 2.2</a></li> </ul> </li> <li><a href="#">Item 3</a> <ul> <li><a href="#">Item 3.1</a></li> <li><a href="#">Item 3.2</a> <ul> <li><a href="#">Item 3.2.1</a></li> <li><a href="#">Item 3.2.2</a></li> <li><a href="#">Item 3.2.3</a></li> </ul> </li> </ul> </li> <li><a href="#">Item 4</a></li>

Has anybody some idea in generating proper <li><ul> tags for the fields so that it becomes as above ..
Note it can be n level deep.
Thanks in advance for any tips and suggestions.

[Habtom]

<?php
for ($x=1; $x<10; $x++) {
echo '<li><a href="#">Item '. $x .'</a>';
for ($y=1; $y<=$x; $y++) {
echo '<ul>';
for ($z=1; $z<=$y; $z++) {
echo '<li>'. $x .'.'. $y .'.'. $z .'</li>';
}
echo '</ul>';
}
echo '</li>';
}
?>