ModalPopupExtender opens on Safari

[davb]

Hi,

I have AJAX ModalPopupExtender which works fine on IE and FF. However, on Safari it pops up on page load without any call. I attached simplified code, just in case.
Any ideas, please?

<asp:LinkButton ID="lnkInvisibleToFireModePopup" Text="" runat="server" style="display: none;"/>

<ajax:ModalPopupExtender
ID="AdminPopup" runat="server"
TargetControlID="lnkInvisibleToFireModePopup"
CacheDynamicResults="true"
PopupControlID="panAdminPopup"
BackgroundCssClass="modalBackground"
CancelControlID="btnCancel">
</ajax:ModalPopupExtender>

<aspPanel ID="panAdminPopup" runat="server"
style="display:none;"
Height="600px" Width="1000px"
CssClass="modalWindow"
ScrollBars="None">

<asp:UpdatePanel ID="upPopup" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:LinkButton ID="lbtnSave" runat="server" Text="SAVE" />
<asp:LinkButton ID="lbtnCancel" runat="server" Text="CLOSE" />
<asp:Button ID="btnCancel" runat="server" Text="Cancel"
style="display:none;"/>

</ContentTemplate>
</asp:UpdatePanel>

</aspPanel>