scrollable content III iframe

[ron]

1) Script Title: scrollable content III

2) Script URL (on DD): http://www.dynamicdrive.com/dynamici...ramescroll.htm

3) Describe problem: This scripts works with onmouseover arrows. The speed slows down when I first brows other sites (only ie). Only when I open the page in a new browser window, the speed is ok.
example here; http://www.robertterenstra.nl/recensie%202.htm
Any ideas?