ajax toolkit always visible extender is not working in ie browser

hello
i am developing small appliction that is.in that i want to place a div element always top right it work fine in firefox browser but it not working in ie what is the problem microsoft official site also have that problem..  if any solution plz give me any suggestion aslo
http://www.asp.net/ajaxlibrary/act_AlwaysVisible.ashx
check this link in ie as well as firefox
my code is

<div ID="divVisible" runat="server" style="background-color:#f09699;border:solid 1px #000000; width:100px;height:150px">
This is the control that I always want
to be visible.at middel Right
see the effect by scroll Down div>

<asp:AlwaysVisibleControlExtender ID="AlwaysVisibleControlExtender1" TargetControlID="divVisible" runat="server" HorizontalSide="Right" VerticalSide="Middle"
VerticalOffset ="20" HorizontalOffset="20" ScrollEffectDuration=".1">
asp:AlwaysVisibleControlExtender>