checkbox Server Control OnCheckedChanged

Question

hello , i have this code and it run perfectly with input checkbox html contol

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" Title="Untitled Page" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<script  language="javascript" type="text/javascript" >

              function chvisible(controlId)

                {

                    var control = document.getElementById(controlId);

                    if(control.style.display == "none" || control.style.display == "")

                        control.style.display = "block";

                        control.body.text="";

                    else

                        control.style.display = "none";

                } 

</script>

        <asp:TextBox ID="TextBox1" runat="server" Style="display: none"></asp:TextBox>

        <input id="Checkbox1" type="checkbox" onclick="chvisible('<%=TextBox1.ClientID %>');"/>

</asp:Content>

when i change the <input >   to CheckBox  
what i will write instead of  "chvisible('<%=TextBox1.ClientID %>');"
in onCheckedChanged Event ?????

checkbox serverside control doesnt hava  onclick event 

when i try to write this following , it dont run 

<asp:CheckBox ID="CheckBox2" runat="server" OnCheckedChanged="chvisible('<%=TextBox1.ClientID %>');" />