I have been using php for developing web application for the past couple of years but new to AJAX. I have implemented tooltip facility on a web application with the help of AJAX successfully and it is working fine. One of my friends, who is been working with AJAX with implementation for more than a year has helped me in implementing the tooltip facility. I will share your problem with the tooltip class with him so that I think he can help you. I have saved the codes that you pasted in this post so that I can show it to him.