way of calling "javascript function of parent window from child window."

Hi,

Here i am going to explain how to call the javascript function of a parent window from the child window(pop-Up).

Some may know before reading this post.

Parent Java Script Function: 

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

    function CallAlert()

    {

        alert("This is parent window's alert function.");

    }

</script> 

Child window's Java Script Function:

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

    function SetParentWindowsHiddenFieldValue()

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

    function SetParentWindowsHiddenFieldValue()

    {

        window.opener.document.getElementById("HiddenField1").value =

                            document.getElementById("TextBox1").value;

        return false;

    } 

  function CallParentWindowFunction()

    {

        window.opener.CallAlert();

        return false;

    }

</script>