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jQuery('div.permissionsType select[name$="permissions.type"]').val('some'); // some types
jQuery('div.permissionsType > ul li > select').val('some'); // set access for all types to to 'some'
jQuery('div.permissionsType > ul li').find('input[type=checkbox][value$="/write"]').prop('checked', 0); // uncheck all "Write" boxes
jQuery('div.permissionsType > ul li').find('input[type=checkbox][value$="/publish"]').prop('checked', 0); // uncheck all "Publish" boxes