fix the position of asp:CalendarExtender

fix-calendar-position.aspx.cs

<asp:TextBox ID="idInputButton" runat="server" />
<asp:ImageButton ID="idImageButton" ImageUrl="~/Images/calender.png" AlternateText="Click to show calendar" runat="server" />
<asp:MaskedEditExtender ID="fromCalendarMEE" runat="server"
    TargetControlID="idInputButton" Mask="9999/99/99" MaskType="Date" Century="2000" AutoComplete="true" CultureName="sv-SE"/>
<asp:CalendarExtender OnClientShown="fixCalendarPosition" ID="fromCalendarButtonExtender" runat="server" TargetControlID="idInputButton" PopupButtonID="idImageButton" Format="yyyy'-'MM'-'dd" />

<script type="text/javascript">
function fixCalendarPosition(cal) {
    var off = $(cal._element).offset();
    $(cal._container).css({position: 'fixed', left: off.left, top: off.top + 22});
}
</script>