Windows Taskbar & Maximiser

Currently I'm using Maximiser on two 19" widescreen monitors using Horizontal Span in Windows XP Pro. I have the Taskbar set to autohide but whenever I have the focus on the "second" instance of WoW the Taskbar rises with the "first" instance flashing as if it requires attention. I'm just wondering if anyone else has encountered this and, if so, whether you found a solution to the issue. The only thing I can think of at the moment is to reduce the height of my Maximiser frame by 5 or 10 pixels so that even if the taskbar is up that it wouldn't hide any of my WoW toolbars.

here you go:
New to 3 boxing -simple question

Thanks - had tried searching using Taskbar and Maximiser as search terms - obviously I need more savvy regarding searching on the site ;)