两个checkbox互斥的有关问题

两个checkbox互斥的问题
页面上放了两个checkbox
<asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" oncheckedchanged="CheckBox1_CheckedChanged"/>
<asp:CheckBox ID="CheckBox2" runat="server" AutoPostBack="True" oncheckedchanged="CheckBox2_CheckedChanged"/>
后台代码如下：
  protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
  {
  if (CheckBox2.Checked)
  {
  this.CheckBox1.Checked = false;
  this.textbox1.Visible = true;
  }
  else
  {
  this.CheckBox1.Checked = true;
  this.textbox1.Visible = false;
  }
  }
  protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
  {
  if (CheckBox1.Checked)
  {
  this.CheckBox2.Checked = false;
  this.textbox1.Visible = false;
  }
  else
  {
  this.CheckBox2.Checked = true;
  this.textbox1.Visible = true;
  }
  }
感觉没什么问题，可是我点击任何一个checkbox都没反应，这是怎么回事啊

[解决办法]

JScript code

 function forCheck1(cb) {            alert(cb);            var cb2 = document.getElementById("<%=CheckBox2.ClientID %>");            cb2.checked = !cb.checked        }        function forCheck2(cb) {            var cb1 = document.getElementById("<%=CheckBox1.ClientID %>");                       cb1.checked = !cb.checked        }