function imprimer() {
	var	Xmax    = screen.width;
	var	Ymax    = screen.height;

	var X = 650;
	var Y = 400;
	
	var Xoffset = (Xmax - X) / 2;
	var Yoffset = (Ymax - Y) / 2;

	window.open("imprimer.html","imprimer","toolbar=no,status=no,location=no,resizable=no,scrollbars=yes,copyhistory=0,menubar=no,width=" + X +",height=" + Y + ",Left=" + Xoffset + ",Top=" + Yoffset);
}