模态窗口间传递多个值

在web应用中，如何以模态窗口方式新打开子窗口，并往子窗口里传递多个值，而在子窗口中，能接受这些值，并且对这些值修改后，可以再提交传递给父窗口呢？在codeproject上，有篇文章介绍了方法，下面介绍如下：
1 先建一个叫ParentWebForm的父窗口，写入其中的HTML代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
    <HEAD>
        <title>Parent Webform</title>
        <script language="javascript">
function OpenChild() 
{
    var ParmA = retvalA.value;
    var ParmB = retvalB.value;
    var ParmC = retvalC.value;
    var MyArgs = new Array(ParmA, ParmB, ParmC);
    var WinSettings = "center:yes;resizable:no;dialogHeight:300px"
    //ALTER BELOW LINE - supply correct URL for Child Form
    var MyArgs = window.showModalDialog(
   "http://localhost/ModalWin/ChildWebForm.aspx", MyArgs, WinSettings);
    if (MyArgs == null)
    {
        window.alert(
          "Nothing returned from child. No changes made to input boxes")
    }
    else
    {
        retvalA.value=MyArgs[0].toString();
        retvalB.value=MyArgs[1].toString();
        retvalC.value=MyArgs[2].toString();
    }
}
        </script>
    </HEAD>
    <body>
        <P><INPUT >
                Open Child Window</BUTTON>
        </P>
    </body>
</HTML>

2 建立一个叫ChildWebform 的窗体，写入HTML代码如下
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
    <HEAD>
        <TITLE>Child Webform</TITLE>
        <script language="javascript">
function Done() {
    var ParmA = tbParamA.value;
    var ParmB = tbParamB.value;
    var ParmC = tbParamC.value;
    var MyArgs = new Array(ParmA, ParmB, ParmC);
    window.returnValue = MyArgs;
    window.close();
}
function doInit() {
    var ParmA = "Aparm";
    var ParmB = "Bparm";
    var ParmC = "Cparm";
    var MyArgs = new Array(ParmA, ParmB, ParmC);
    MyArgs = window.dialogArguments;
    tbParamA.value = MyArgs[0].toString();
    tbParamB.value = MyArgs[1].toString();
    tbParamC.value = MyArgs[2].toString();
}
        </script>
    </HEAD>
    <BODY onload="doInit()">
        <P>Param A:<INPUT >OK</BUTTON>
    </BODY>
</HTML>