How to handle onclk event for asp : menuitem

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ASP.NET

<div class="menu" "popout level1 static active" id='div_Menu' style='visibility: hidden'; >
        <span class="before">&nbsp;</span>

          <asp:Menu ID="NavigationMenu" runat="server"  CssClass="menu" EnableViewState="false" IncludeStyleBlock="false" Orientation="Horizontal" RenderingMode="List">
            <Items>

                <asp:MenuItem  Text="Bedroom" NavigateUrl="~/category/1-bedroom.aspx"   >
                    <asp:MenuItem  Text="Bedroom Set" NavigateUrl="~/category/95-bedroom-set.aspx" />
                    <asp:MenuItem  Text="Wardrobe" NavigateUrl="~/category/13-wardrobes.aspx">

                    </asp:MenuItem>
                    <asp:MenuItem  Text="Bed" NavigateUrl="~/category/2-bed.aspx"/>

                    <asp:MenuItem  Text="Mattress " NavigateUrl="~/category/101-mattress.aspx">
                    <asp:MenuItem  Text="Single Bed Mattress" NavigateUrl="~/category/107-single-bed-mattress.aspx"/>
                    <asp:MenuItem  Text="King Bed Mattress" NavigateUrl="~/category/108-king-bed-mattress.aspx"/>
                    <asp:MenuItem  Text="Queen Bed Mattress" NavigateUrl="~/category/109-queen-bed-mattress.aspx"/>
                   </asp:MenuItem>

How to create an onclick event for asp menuitem .

Onclick of this menuitem i want it to change its background colour so if any suggestions?