function popup(page,largeur,hauteur,options,nomFenetre)
{
	var top=(screen.height-hauteur)/2;
	var left=(screen.width-largeur)/2;
	var mywindow = window.open(page,nomFenetre,"top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
	mywindow.focus();
}