Treeview populates in IE and Chrome but not in mozilla firefox

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C#2.0

C#

ASP.NET

I have one tree view in aspx page and i bound the nodes of tree view in code behind page. but now the problem is that the tree view is populating in IE and Chrome but not in Mozilla fire fox


plz help...

aspx code

<td align="left">
                                                                                   <asp:TreeView ID="tvOfficers" runat="server" ExpandImageToolTip="expand" NodeStyle-VerticalPadding="3"
                                                                                    CollapseImageToolTip="collapse" 
                                                                                    SkinID="Simple" ExpandDepth="2" NodeWrap="True" CssClass="arial16grey_act"
                                                                                    NodeIndent="0" CollapseImageUrl="~/images/yoo.gif" ExpandImageUrl="~/images/yoo.gif"
                                                                                    Width="100%">

                                                                                   </asp:TreeView>
                                                                               </td></tr>