How to assign C# variable to asp element using javascript

I want to assign a csharp variable to the element of asp page using javascript. It seems the assignement is not working in my code.

Here it is:

document.getElementById('lbAccessories').innerHTML = '<%#SelectLabel%>';

In my asp code i use:

<asp:LinkButton ID="lbAccessories" runat="server" />'

I can't assign the value directly to the linkbutton using Text='<%#SelectLabel%>' because i want to make it more intelligent.

Does anyone knows how to do with that?

Thanks

Edit:

Here is my code, I've tried to use <%=lbAccessories.clientId%>, but it generates an error : lbAccessories does not exist in the context.

<script type="text/javascript">
    function function(Ref) {
        if ('<%=TextBoxClientID%>' == 'txtLink') 
        {
            document.getElementById('lbAccessories').innerHTML = '<%#SelectLabel%>';
        }
        else if ('<%=TextBoxClientID%>' == 'btnSearch') {
            document.getElementById('lbAccessories').innerHTML = '<%#ViewDetail%>';
        }
    }

 </script>

Edit:

<asp:GridView ID="gv1" AutoGenerateColumns="false" runat="server" 
    AllowPaging="true" OnPageIndexChanging="pic">
    <Columns>
        <asp:TemplateField HeaderText="">
            <ItemTemplate>
                <asp:LinkButton ID="lbAccessories" runat="server" OnClientClick='<%#string.Format("passAccessory(\"{0}\");", Eval("Ref"))%>'></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Edit:

Thanks so much for everyone who had posted the suggestions.

I have changed the javascript code to the following:

<script type="text/javascript">
    function passAccessory(accessoryRef) {

        if ('<%=TextBoxClientID%>' == 'txtLink') {
            document.getElementById('<%= gvAccessories.FindControl("lbAccessories").ClientID %>').innerHTML = '<%#SelectLabel%>';
        }
        else if ('<%=TextBoxClientID%>' == 'btnSearch') {
            document.getElementById('<%= gvAccessories.FindControl("lbAccessories").ClientID %>').innerHTML = '<%#ViewDetail%>';
        }
    }
</script>

in *.aspx.cs file, i have added: protected LinkButton lbAccessories { get; set; }

It throws an exception: "Object reference not set to an instance of an object"

Anyone have ideas? Thanks so much

Edit:

Finally, we did it with csharp code. It's more flexable and manageable. My colleague helped me. Thank you all for your help!!!