img1 = "/img/jeunesse-youth/commun-common/slideshow_pause.gif";
img2 = "/img/jeunesse-youth/commun-common/slideshow_play-jouer.gif";
function chng(img) {
if (document.getElementById('img').src.indexOf(img1)!= -1) document.getElementById('img').src = img2;
else document.getElementById('img').src = img1;
}