File Upload program with return value

Hello,
I have the following code in my Java program which I use to upload files and return the value of "filename" to the original opening window. Somehow there where changes which now invalidates this piece of code and gave a javascript error message of
"Error : Access is denied"
"Code : 0"
Here is the portion of the code where processing seems to stop.
fileOut.flush();
out.println("<script language='javascript'>");
out.println("this.window.opener.document.frm.sign2.value='" + saveFile + "';");
out.println("window.close()");
out.println("</script>");
out.println("<br> !!! File written " +
"<br> This is an attachment confirmation page" +
"<br> *** Please close this window ***");
More particularly the statement --> out.println("this.window.opener.document.frm.sign2.value=" + saveFile + ";");
As I have stated, this program worked before and returns the value to the opening window.
Now, it can still upload but doesn't not return the saveFile to the field sign2 of the opening window.
Any help or leads will be very helpful and appreciated.
Thanks very much.
Juan

No need of ; after window.close() ?

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      exit.
    endloop.
else.
    message id sy-msgid type sy-msgty number sy-msgno
               with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif.
endform.                                 " F_get_f4_filename
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