Just got around to testing this Jerry.
Very simple, and works a treat.
Much appreciated.
For anyone else trying to do it…
To change from default post sort order, then pass through URL as follows…
https://url.com/?order=ASC
(Note: case sensitive)
Then, in Child version of index.php, after
<?php /* Start the Loop */ ?>
Enter…
<!-- Change sort order using URL query string-->
<?php
if ( $_GET['order'] == "ASC" ){
global $query_string; query_posts($query_string . "&order=ASC");
}
else {
global $query_string; query_posts($query_string . "&order=DESC");
}
?>