Implements hook_block_save().
function statistics_block_save($delta = '', $edit = array()) {
variable_set('statistics_block_top_day_num', $edit['statistics_block_top_day_num']);
variable_set('statistics_block_top_all_num', $edit['statistics_block_top_all_num']);
variable_set('statistics_block_top_last_num', $edit['statistics_block_top_last_num']);
}