// Get Geneology Tree
function get_geneology_tree($parent_id=0, $output=""){
    if(empty($parent_id))
        $sql="SELECT *, CONCAT(title,' ',first_name,' ',middle_name,' ',last_name) as full_name
                FROM mlm_user_mst
                WHERE parent_id='$parent_id'
                  AND user_type<>'Admin'";
    else
        $sql="SELECT *, CONCAT(title,' ',first_name,' ',middle_name,' ',last_name) as full_name
                FROM mlm_user_mst
                WHERE mlm_user_id_pk='$parent_id'
                  AND user_type<>'Admin'";

    $result=mysql_query($sql)or die(mysql_error());
    $num_rows=mysql_num_rows($result);

    if(!empty($num_rows)){

        $output='<ul'.((empty($output))?' id="org"':'').'>';

        $arrres=mysql_fetch_assoc($result);

        $output.='<li>'.$arrres['full_name'];

        if(!empty($arrres['left_id'])){
            $output.=get_geneology_tree($arrres['left_id'], $output);
        }

        if(!empty($arrres['right_id'])){
            $output.=get_geneology_tree($arrres['right_id'], $output);
        }

        $output.='</li>';

        $output.='</ul>';
    }

    return $output;
}