Master Page Menu items hide in Content Page.

I have menu like below :

I want to hide some menu items in Child page when child page is Load. plz give me advice how can i do this.

<div>

    <ul id="navmenu">   

    <li class="style1"><a href="#"> Home a>li>

    <li><a href="#" target="_self"> Edita>

    <ul class="sub1">

            <li><a  href="cust.aspx" target="_self"> Add Category a>li>

            <li><a  href="search.aspx" target="_self"> Delete a>li>

            <li><a  href="search.aspx" target="_self"> Update a>li>

    li>

    ul>

    <li><a href="frmInputForm.aspx" target="_self" target="_self"> Add Consumera>li>

    <li><a herf="#"> SMS SENDa>

            <ul class="sub1">

                <li><a href="MainPage.aspx" target="_self">Template SMS a>li>

                <li><a href="custSMS.aspx" target="_self">Customize SMSa>li>

                <li><a href="#" target="_self">Upload Filea>

                    <ul class="sub2">

                        <li><a href="uploadDetail.aspx"> Excela>li>

                        <li><a herf="#"> Worda>li>

                        <li><a herf="#"> Othera>li> 

                   ul>

                li>  

           ul>

    li>

    <li><a herf="#"> Reporta>li>

            <li><asp:LinkButton ID="LinkButton1" runat="server" Height="24px"

                    Width="105px" onclick="LinkButton1_Click">Logoutasp:LinkButton>li>

    div>