How to parse parameter from child window to parent window in JSP

Question

I have two JSP i.e. course1.jsp and course2.jsp. I would want to find out how I could parse the parameter/value from child window to the parent window when the child window get closed.
What I am trying to do is actually a file upload process. The child windows will open for user to upload the file, and when close, the file name will be parse into the parent form for database update. Is this something possible at all? or is there any other better approaches.
Thank you.
These are the two files:
--------course1.jsp ------------
Attach File <p>
<FORM name="courseForm" action="course2.jsp" method="post" enctype="multipart/form-data">
<TABLE cellSpacing=1 cellPadding=3 border=0 WIDTH=500>
<TR >
<TD>
<input type="text" NAME="f_file_name" size="30" VALUE="this value should be taken from child windows">
get file name
<p>
     <INPUT class="buttons" TYPE="submit" NAME="submit" VALUE="Submit">
</TD>
</TR>
</TABLE>
</FORM>
---- course2.jsp -------
<%
String filename = "this is the string needs to go back to parent windows when I click on close";
%>
<p>
close

Answer 1

In course2.jsp, you have to write some javascript code to reload the parent window document to reload the document with an added parameter. But, instead of doing this, you can also do simple thing; in course2.jsp, you can reference course1.jsp controls via javascript object, "parent". On closing event of course2, you can write:
parent.courseForm.f_file_name.text = '<%=filename%>' ;
window.close() ;
But for this to work, you must open your course2.jsp document thru window.open() function instead of simple hyper link (as you did thru ).
So, modify the hyperlink line like below:
get file name
Hope it helps.