button to Print page or Click actions on list to Print page

Hi,
i'd like to insert a button in list page or edit page that redirect to print page of my record.

i put in the on Client after
location.href="distinte_print.php";

but the page opened is always the print page of my 1st record in the table "distinte"

the same if i use click actions - open page - Print Page on a field of my list page of table "distinte".

how may i pass the key value of the record to the print page?

phprunner enterprise 9.8 build 29929 x64

thanks
Fabio