echo "<script>";
echo "function change(select) {";
echo " window.open('helpdesk.public.php?create_ticket=1&active_entity=' + select.value,'_self'); "
echo "}"
echo "</script>";
// ...
echo '<td>Local</td>';
echo '<td>';
echo '<select onchange="change(this)">';
echo '<option value="3">Tecnologia da Informação</option>';
echo '<option value="4">Comunicação</option>';
echo '</select>';
echo '</td>';
echo '</tr>';