function nuevaventana(url,hauteur,largeur) {
var winl = (screen.width - largeur) / 2;
var wint = (screen.height - hauteur) / 2;
date_t = new Date;
time = date_t.getTime();
winprops = 'height='+hauteur+',width='+largeur+',top='+wint+' ,left='+winl+',scrollbars=1,resizable=0'
win = window.open(url, time, winprops)
}