For example if you hange the number 36 to 24 at:

default: $_SESSION['num_time_slots'] = 24; break;
you will be able to view MythWeb on a 1024×756 display without the width being to wide.

Or change

define('show_popup_info', true);
to false and you will not get popups.

MythWeb is the web frontend to MythTV. A few settings on how MythWeb behaves can be accessed through the web browser directly, but a few settings are hidden from the casual user. These settings are stored in the /srv/www/htdocs/mythweb/includes directory. The most important file is config.php, that contains the variables that allow you to change the amount of time slots displayed and a few more.