Rich HTML Balloon Tooltip center the arrow

[onigetoc]

1) Script Title:
Rich HTML Balloon Tooltip

2) Script URL (on DD):
http://www.dynamicdrive.com/dynamicindex5/balloontooltip.htm

3) Describe problem:

Hi, i need some help with the balloon Tooltip.

I want the arrow to be centered and to be exactly right on the mouse poiter and not at the left.

I want to use the script to work over small icons and to be exactly centered
here the example i'm working on (i want it to look like the facebook tooltip)
http://www.mymixsocial.com/js-tooltip2.html

Any idea?

Thank's