Accordion panel is not working on page..?

hello,

i write following  code for accordion panel but its not open on page .....

<asp:Accordion ID="Accordion1" runat="server"
        BorderColor="Black" RequireOpenedPane ="false" SelectedIndex ="-1"
        HeaderCssClass="acco_header"
        style="margin-left: 151px; top: 387px; left: 47px; position: absolute; height: 175px; margin-top: 0px;"
        Width="322px" >
   
    <Panes>
        <asp:AccordionPane ID="AccordionPane1" runat="server" HeaderCssClass ="acco_header" ContentCssClass="acco_content" Width="100" Height="28" BorderColor="Black">
        <Header>
            Forgot Password
        </Header>
        <Content>
        
            <h4>E-mail:</h4><asp:TextBox ID="text1" runat ="server" Width="150" Height="25"></asp:TextBox><br /><br />
            <asp:Button ID="Button3" runat ="server" Text ="Submit" OnClick = "Button3_Click" BackColor="#FFDB70"/>
       </Content>
        </asp:AccordionPane>
            </Panes>
      </asp:Accordion>
      
   so how to solve this problem..

Thanks,