Refernce to table after closing popup window

edv007

Hello,
I am new here and have some beginner questions to get my tables running. I am using my own webserver (developed with
Xbase++) and try to edit table rows using a icon and a link that calls a function in my webserver. I open a window with window.open(), edit the values in a form und send them back to my webserver. After storing back the values in the database I would like to change the values in the row for example with table.cell( idx, 0 ).data( 'Updated 1' ).draw();
I send back from my webserver a script to close the edit window, In this script I would like to make a reference to the table of the calling window and change the values bevore closing the window. With window.opener.document.getElementById("mytable"); I get a [object HTMLTableElement] object, but further table manipulation does not work. Whats wrong here ? How can I get a reference to the table of the calling window ?
regards
Rudolf