Button 的Click事件失效

Question

我在页面有一个层：<div class="popup" id="divPwd" visible="false" style="position:absolute; top:250px; left:500px;" runat="server">在层里有一Button，当我用FireFox浏览时都正常，可是用IE8 浏览时Button的Click事件无法触发，是怎么回事呢？
记得以前用IE6做过类似的功能，没有出现这种情况。

Answer 1

<div class="popup" id="divPin" visible="false" style="position:absolute; top:250px; left:500px;" runat="server">
        <p>
            请输入您对本次服务的评价：</p>
        <p>
            <asp:TextBox ID="txtPin" runat="server"></asp:TextBox>
        </p>   
      
             
        <div class="verify_wz">
            1.非常满意<br />
            2.比较满意<br />
            3.不满意
        </div>
        <div class="verify">
            <asp:Button ID="btnPin" runat="server" CssClass="btn_verify" Text="确认" 
                onclick="btnPin_Click"  /><asp:Button ID="btnPinCancel" 
                CssClass="btn_verify" runat="server" Text="取  消" onclick="btnPinCancel_Click" /></div>
    </div>
 protected void btnPin_Click(object sender, EventArgs e)
    {
        string pin = this.txtPin.Text.Trim();        if (pin.Length < 1)
        {
            ClientScript.RegisterClientScriptBlock(this.GetType(), "msg", "alert('请对服务作出评价!');", true);
            this.txtPin.Focus();
            return;
        }        if (new BaseClass_WT.TaoCanCard_WT().Card_KouFei(this.txtCardNo.Value, this.txtMoney.Value.ToString()))
        {
            ClientScript.RegisterClientScriptBlock(this.GetType(), "msg", "alert('交易成功!');", true);
            this.divPin.Visible = false;
            this.plBpdy.Enabled = true;        }
        else
        {
            ClientScript.RegisterClientScriptBlock(this.GetType(), "msg", "alert('系统错误，请重试!');", true);
            return;
        }
    }