我希望在单击菜单时隐藏其他菜单项

我正试图找出如何通过单击菜单来隐藏其他子菜单项。现在，当两个菜单都被点击时，它们都会显示出来，这是我不想要的。

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 <div class="navigation">
    <ul class="accordion">
        <li>
            <asp:HyperLink ID="about" runat="server" href="#" text="testing" />
            <div class="sub accordion">
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                    <li><asp:HyperLink ID="aboutTraci" runat="server" NavigateUrl="traci.aspx" Text="Traci" /></li>
                    <li><asp:HyperLink ID="aboutTheBegan" runat="server" NavigateUrl="#" Text="How It All Began" /></li>
                    <li><asp:HyperLink ID="aboutDesigners" runat="server" NavigateUrl="#" Text="Designers" /></li>
                    <li><asp:HyperLink ID="aboutPlaygroup" runat="server" NavigateUrl="#" Text="Playgroup" /></li>
                    <li><asp:HyperLink ID="aboutPlayground" runat="server" NavigateUrl="#" Text="Playground" /></li>
                    <li><asp:HyperLink ID="aboutTestimonials" runat="server" NavigateUrl="testimonials.aspx" Text="Testimonials" /></li>
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                    <li><asp:HyperLink ID="HyperLink3" runat="server" NavigateUrl="#" Text="How It All Began" /></li>
                    <li><asp:HyperLink ID="HyperLink4" runat="server" NavigateUrl="#" Text="Designers" /></li>
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                    <li><asp:HyperLink ID="HyperLink7" runat="server" NavigateUrl="testimonials.aspx" Text="Testimonials" /></li>
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        </li>
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我想在单击某个菜单项时隐藏其他菜单项。

感谢