var nombre = 1;
var temps = new Date()
var seconde = temps.getSeconds()
var banniere = seconde % nombre;
banniere +=1;
if (banniere==1) {
url="http://www.be-sv.fr";
alt="pub";
banner="http://www.agroprocess.net/2011/banner/besv.jpg";
width="544";
height="272";
}
document.write('<center>');
document.write('<a href=\"' + url + '\" target=\"_blank\">');
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0></a>');
document.write('</center>');