I'm sorry for my silly. I used SSH service to connect the host and it has changed the name of HTML_TreeMenu into html_treemenu so system could not open the TreeMenu.php. It's OK now. Thanh you for your help. Best wishes to you. ******************************************************* Tran Anh Tu Vien CNTT - DHQG Ha Noi Phone: 047680417-25 Email trantu@xxxxxxxxxx *******************************************************