var cmpt = 0; 
var l = document.getElementById('arrow-l'); 
l.onclick = left; 
var r = document.getElementById('arrow-r'); 
r.onclick = right; 
var img = [ 
  { src: "http://ekladata.com/J9Grc5fH7e2IMPqiFKWav69QSpA/event4.png", url: "http://headwinds.cd.st/nouveautes-01-05-2022-a212482965", alt: "mises à jour" }, 
  { src: "http://ekladata.com/mWm0CSIovYhvIBO-INR4dYMmseQ/event3.png", url: "http://headwinds.cd.st/des-cours-de-pouvoirs-a205249756", alt: "cours de pouvoirs: toi aussi apprends à utiliser les tiens" } 
]; 

var nbImg = img.length; 

function mod(n, m) { 
  return ((n % m) + m) % m; 
} 

function left() { 
  var content = document.getElementById('events'); 
  cmpt = mod(cmpt - 1, nbImg); console.log(cmpt); 
  var txt = "<a href=\"" + img[cmpt].url +"\"><img src=\"" + img[cmpt].src + "\" alt=\"" + img[cmpt].alt + "\" width=\"335\" height=\"158\" /></a>";
  content.innerHTML = txt; 
} 

function right() { 
  var content = document.getElementById('events'); 
  cmpt = mod(cmpt + 1, nbImg);
  console.log(cmpt);
  var txt = "<a href=\"" + img[cmpt].url +"\"><img src=\"" + img[cmpt].src + "\" alt=\"" + img[cmpt].alt + "\" width=\"335\" height=\"158\" /></a>";
  content.innerHTML = txt; 
}