function popup_print(id_prod) {
	// largeur et hauteur
	var w = 500;
	var h = 400;
	// centrage
	var p_left = (screen.width) ? (screen.width-w)/2 : 0;
	var p_top = (screen.height) ? (screen.height-h)/2 : 0;
	
	var p_print = window.open('print.php5?id=' + id_prod, 'aide', 'toolbar=no,location=no,status=no,menubar=no,resizable=no,width=' + w + ',height=' + h + ',top=' + p_top + ',left=' + p_left);
	
	if (p_print.window.focus) p_print.window.focus();
}