防止频繁点击按钮的js代码

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

        var btndelayId; //定时器编号
        var btndelaytip = 100; //倒计时次数
        function _SetTip(obj, oldvalue) {
            if (obj) {
                obj.disabled = true;
                obj.value = "查询中";
                btndelaytip--;
                if (btndelayId && btndelaytip < 0) {
                    window.clearInterval(btndelayId);
                    btndelaytip = 100; ; //还原倒计时次数
                    obj.value = oldvalue;
                    obj.disabled = false;

                }
            }
        };
        function SetTip(obj, oldvalue) {
            return function () {
                _SetTip(obj, oldvalue);
            }
        };
        function DoDelay(obj) {
            var oldvalue = obj.value;
            btndelayId = window.setInterval(SetTip(obj, oldvalue), 100); //每1/10秒更新计数
        };

    </script>

调用代码：

 <form id="form1" runat="server">
    <div>
        <asp:Button ID="btnSub" runat="server" Text="查  询" Width="60" OnClientClick="DoDelay(this);" onclick="btnSub_Click" />

    </div>
</form>

后台代码：

protected void btnSub_Click(object sender, EventArgs e)
        {
            Thread.Sleep(6000);
            Response.Write("infos");
        }

但是这里不能针对同一个页面的多个按钮重复使用

var btndelayId; //定时器编号
var btndelaytip = 5;//倒计时次数

谁有好的方法？

另附网上找到的防止连续点击两次按钮JS方法：

 function doubleCheck(){
    if (window.document.readyState != null &&
            window.document.readyState != 'complete')
    {
        alert("正在处理，请等待！");
        return false;
    }
    else
    {
        MessageClear();
        return true;
    }
}
在C#代码中：
this.backButton.Attributes["onClick"]         = "return doubleCheck()";