I had dynamically creating the drop down list and placed in the tablecell and based on the button click ?

I had dynamically created the drop down list and placed in the tablecell and based on the button click i need to show the panel on top of the drop down list. But I'm facing the problem that whenever I'm placing the panel on the top of the drop down list, the drop list control is getting displayed on top of the panel. Any help is appreciated.

Note: I'm facing this problem only in IE6, remaining browsers is working fine (IE8, FF, and Chrome)



<asp:Panel ID="_deviceSettingsDetailPanel" runat="server" Style="display: none; width: 506px;height: 236px; z-index:1000;">
<asp:Table id="_deviceSettingsDetailTable" runat="server" style="background-repeat: no-repeat;
width: 506px; height: 236px;">
<asp:TableRow style="text-align: center; font-size: 28px;">
<asp:TableCell style="padding-top: 30px;">
<asp:Label ID="_deviceSettingsDetailLabel" runat="server"> asp:Label>
asp:TableCell>
asp:TableRow >
<asp:TableRow style="text-align: center">
<asp:TableCell >
<asp:Button runat="server" ID="Button1" meta:ResourceKey="MessageLabel_OK" class="font-standard font-large black_button"
OnClick="OkClicked" />
 
asp:TableCell>
asp:TableRow >
asp:Table>
asp:Panel>