Ksa, спасибо за разъяснения. Выкладываю часть кода.
exec.php(родительское)
.....
function DoSubmit(){
var w = 450;
var h = 200;
var leftvar = (screen.width-w)/2;
var topvar = (screen.height-h)/2*0.5;
var new_window = window.open(\"\", \"kv2\", \"resizable=no, location=no, width=\"+w+\",height=\"+h+\",left=\"+leftvar+\",top=\"+topvar+\"\");
hid_val = document.getElementById(\"field_entered_surname\").value;
document.getElementById(\"form_surname_pac\").value = hid_val;
document.forms.form_surname_pac_search.submit();
}
.....
</tr>
<tr align = \"center\" height = \"5%\" id=\"row_panel\">
<td class = \"close\" id = \"td_clsp\" onclick = \"window.close();\" colspan = \"2\">
Закрыть
</td>
</tr>
<form action = \"search_pac.php\" method = \"POST\" name = \"form_surname_pac_search\" target = \"kv2\">
<input type = \"hidden\" id = \"form_surname_pac\" name = \"surname_pac\" value = \"\">
</form>
</table>
<form method = \"POST\" name = \"form_save_ent\" id = \"form_id\">
<input type = \"hidden\" id = \"selected_id_pac\" name = \"id_pac\" value = \"\">
</form>
search_pac.php (дочернее)
....
var parenttbl = window.opener.document.getElementById(\"row_panel\");
var newel = window.opener.document.createElement('td');
var elementid = document.getElementsByTagName(\"td\").length
newel.setAttribute('id',elementid);
newel.innerHTML = \"Запись\";
newel.onclick = function() {document.forms.form_save_ent.submit();};
parenttbl.appendChild(newel);
window.close();
....