function show(numero) {
var a = document.getElementById("article"+numero);
var f = new Array()
f[1] = "images/articles/a.jpg";
f[2] = "images/articles/b.jpg";
f[3] = "images/articles/c.jpg";
f[4] = "images/articles/d.jpg";
f[5] = "images/articles/e.jpg";
f[6] = "images/articles/f.jpg";
f[7] = "images/articles/g.jpg";
f[8] = "images/articles/h.jpg";
f[9] = "images/articles/i.jpg";
f[10] = "images/articles/j.jpg";
f[11] = "images/articles/k.jpg";
f[12] = "images/articles/l.jpg";
var url = f[numero];
a.setAttribute('href', url);
myLightbox.start(a);
}