It would be just a matter of changing the associated SQL.
It looks like it is already done on that page...
but anyway it would be a matter of updating the query:
SELECT ps3_options.OptionID, OptionName FROM ps3_options INNER JOIN ps3_optiongroups ON ps3_optiongroups.OptionGroupID = ps3_options.OptionGroupID WHERE ps3_options.OptionGroupID = %s
to:
SELECT ps3_options.OptionID, OptionName FROM ps3_options INNER JOIN ps3_optiongroups ON ps3_optiongroups.OptionGroupID = ps3_options.OptionGroupID WHERE ps3_options.OptionGroupID = %s ORDER BY OptionName
on both the products_detail.php page and the products_detail_lookup.php page.