url = 'http://www.boxofficemojo.com/data/js/wknd5.php';
total = zeros(5,1);
page = urlread(url);

for i = 1:5
  target = sprintf('%d. ', i);
  gross = urlfilter(page, target, 2);
  if length(gross) < 2 || gross(2) == i+1
    total(i) = gross(1);
  else
    total(i) = gross(2);
  end
end

updatetrend(sum(total));