function carre(id,event){
  x=event.screenX;
  y=event.screenY;
  xx=x-200;
  yy=y-100;
  var divcarre = document.getElementById(id);
  divcarre.style.top=yy+'px';
  divcarre.style.left=xx+'px';
  divcarre.style.position="absolute";
  divcarre.style.display="block";}

function nocarre(id){
  var divcarre = document.getElementById(id);
  divcarre.style.display="none";
}