Image button disabled in IE8

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ASP.NET

Hi!

I have a webpage, with several image buttons on it, but for some ppl, the image buttons just don't work. I mean they are not clickable, and the mouse doesn't change, if they pull over it.

Have anybody met with this problem, and have a solution?

Can be cos of session time outs?

Thx, for any answer!

The button:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
              <ContentTemplate>
                  <Triggers runat="server">
                  <div class="wizNavigation">
                  <ul>
                      <li><asp:ImageButton ID="btnSave" runat="server" ImageUrl="~/img/save.png" OnClick="btnSave_Click" ToolTip="Mentés" /></li>
                      <li><asp:ImageButton ID="btnSaveAndSend" runat="server" ImageUrl="~/img/approval_send_disabled.png" OnClick="btnSaveAndSend_Click" ToolTip="Jóváhagyásra küldés" /></li>
                      <li><asp:ImageButton ID="btnPrint" runat="server" Height="36px" ImageUrl="~/img/excel.png" OnClick="btnPrint_Click" ToolTip="Excel dokumentum megnyitása" Width="36px" /></li>
                      <li><asp:ImageButton ID="btnApprove" runat="server" ImageUrl="~/img/approval_yes.png" OnClick="btnApprove_Click" Tooltip="Elfogadás" Visible="false" /></li>
                      <li><asp:ImageButton ID="btnDissapprove" runat="server" ImageUrl="~/img/approval_no.png" OnClick="btnDissapprove_Click" ToolTip="Visszautasítás" Visible="false" /></li>
                      <li><asp:ImageButton ID ="btnCancel" runat ="server" ImageUrl ="~/img/cancel.png" ToolTip="Mégse" OnClick="cancel" /></li>

etc...

I can't code behind, 'cos it's really long. But i am using sessions, my first thought was, that their 20 min default time out was the problem, but i tested it, and the buttons worked fine.