漂亮的JavaScript 弹出对话框

function mm(div_id) {

            div_id = document.getElementById("pi");
           div_id.style.backgroundColor = "#777";
           div_id.style.opacity = "0.6";

           var b=window.confirm("确定要删除吗？");

           div_id.style.backgroundColor = "";
           div_id.style.opacity = "";

           return b;
       }

 

 

<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="if(mm('pi')==false) return false"
            onclick="Button1_Click"/>