Thanks Art lader 
. With a system so good and friendly as moodle, purists we are clumsy: I was trying to change variable resource_framesize in the file \mod\resource\lib.php 
which obvious did not work.
. With a system so good and friendly as moodle, purists we are clumsy: I was trying to change variable resource_framesize in the file \mod\resource\lib.php which obvious did not work.greetings,
Luis
Luis