弹出自定义模式对话框

<script language=javascript>
        function openDialogWin()
        {
           var result =window.showModalDialog("ShowMessage.aspx","","dialogHeight:160px;dialogWidth:300px; status:no; help:no; scroll:no");
           //window.show('ShowMessage.aspx', '','height=300, width=400, top=250,left=250, toolbar=no, menubar=no, scrollbars=no,resizable=no,location=no, status=no','_blank');
            if(result == "Yes")
                window.alert("You Clicked Yes!");
            else if(result == "No")
                window.alert("You Clicked No!");
            //document.writeln(result);
        }
    </script><input type=button value="按钮" name="btn" onclick="openDialogWin()" />