Hi Vincent, This sounds like the IE z-index bug. Here are a few previous threads from this list which address it.
http://groups.google.com/group/jquery-en/browse_thread/thread/826e8157b5fcf6a1/2dffd08fb21309fe?lnk=gst&q=ie+z-index+bug+superfish#2dffd08fb21309fe http://groups.google.com/group/jquery-en/browse_thread/thread/283486ab8cff5545/ca32aa548b171243?lnk=gst&q=ie+z-index+bug+superfish#ca32aa548b171243 http://groups.google.com/group/jquery-en/browse_thread/thread/ff79b03f027dc459/69bc1a7848f38910?lnk=gst&q=ie+z-index+bug+superfish#69bc1a7848f38910 You could probably find even more threads than this as the problem keeps being posted. Good luck. Joel Birch.