MPTtree, Hieararchical trees in a database table

[eluser]Unknown[/eluser]
[quote author="Gamesh" date="1294938660"]there is a bug on PHP 5.3

Code:

function debug_message(&$message){

strings can not be passed as reference, as you are creating a string that is not stored in any variable, and this type of declaration has no meaning and doesn't save memory.
this line of code gives fatal error.[/quote]

I've deleted out this, non-working on php 5.3, debug method, changed all getwhere to get_where and library $this->db->select('title'); to $this->db->select($this->title_col); and it's working just fine for me on codeigniter 2.0 php5.3.5