title: asp.net ajax collapsible panel in ie8 problem
body: <p>Anyone try this simple bit of code in an ie8 browswer and try refreshing the page, </p>
  
  <p>in ie8 you will get an error around getelementbyid on refresh.</p>
  
  <p>When i run it it complains of not being able to find control with id of 'ctl00_main_dd'</p>
  
  <pre><code>&lt;cc1:CollapsiblePanelExtender ID="CollapsiblePanelExtender2" runat="server"     
       ImageControlID="Image2" CollapsedImage="~/App_Themes/IMStandard/icons/uparrow.png"
      ExpandedImage="~/App_Themes/IMStandard/icons/downarrow.png"
       CollapseControlID="dd" ExpandControlID="dd"
       TargetControlID="pnlQuickKeywordSearch"
       SuppressPostBack="true"&gt;
  &lt;/cc1:CollapsiblePanelExtender&gt;
   &lt;asp:Panel ID="dd" runat="server"&gt;
      &lt;h3 class="loginHeader"&gt;
          &lt;asp:Image ID="Image2" runat="server" /&gt;
          &amp;nbsp;&amp;nbsp;Quick Keyword search&amp;nbsp;&lt;asp:Image ID="HelpIconImage" runat="server"
              Width="16px" Height="16px" ImageUrl="~/App_Themes/IMStandard/icons/help.png" /&gt;&lt;/h3&gt;
  &lt;/asp:Panel&gt;
   &lt;asp:Panel ID="pnlQuickKeywordSearch" Style="float: left; border: double 3px #C9DF86;"
      runat="server" &gt;
      &lt;div style="clear: both; padding: 5px;"&gt;
      &lt;/div&gt;&lt;/asp:Panel&gt;
  </code></pre>
  
  <p>Anybody know why this is happening? is it a bug in ie8 or am i missing something?</p>
  
  <p>By the way, i am using masterpages, but i dont think that has anything to do with it.</p>
  
  <p>Thanks</p>