Bar Scrolling when rollover on menu buttons

Hi,

I am new here and also new to actionscript.

My requirement is like below web site.
www.dargroup.com

When you rollover to any menu item you see a bar or triangle moving smoothly with your mouse and when you roll out it goes back.

I tried some of the trick from kirupa forum as well such as restricting the mouse train in a box. but it follows me for that entire Y value throughout the x.

If this sounds confusing please don’t mind. Just looking for something like Dar Site mentioned above.

Please help. Urgent.