Js回传服务器, 控制按钮单击事件 ASP.NET + js高手 嘻嘻

Question

   后台:
           this.TextBox1.Attributes.Add("onmousemove", "stopTimer2()");
            this.TextBox1.Attributes.Add("onmouseout", "startTimer2()");
   
 protected void Button1_Click(object sender, EventArgs e)
    {
        Timer2.Enabled = true;
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        Timer2.Enabled = false;
    }
Js文件:function stopTimer2()
{
if(Timer2Flag==1)
{
__doPostBack("AnchorCall1$Button2","");
Timer2Flag=0;
}}function startTimer2()
{
__doPostBack("AnchorCall1$Button1","");
Timer2Flag=1;
}用JS控制button,然后控制timer2是否可用,为什么会报错呢  高手帮看看吧