function popup(url,hauteur,largeur) 
{
	var winl = (screen.width - largeur) / 2;
	var wint = (screen.height - hauteur) / 2;
	winprops = 'height='+hauteur+',width='+largeur+',top='+wint+',left='+winl+',scrollbars=no,resizable=no'
	win = window.open(url, 'win', winprops)
}