How to refresh the parent page with ajax.?

Hi all,

I have two web forms name called one is "ParentPage.aspx" and the second one is called "ChildPage.aspx". When I am mouse over the button which is displaying in the "ParentPage" i am gonna open the "ChildPage". In the childpage contains a button. If I click this button I need to reload the parent page with getting data from childpage.

I have used AJax to open the "ChildPage".

Here is the code.

ParentPage.aspx:

*********************

<form id="Form1" method="post" runat="server">            
             <table id="Table1" border="1" style="position:absolute; bottom: 387px; left: 485px;">   
           <tr>
 &nb ...