function displayPopup(nom_de_la_page, nom_interne_de_la_fenetre)
{
	window.open (nom_de_la_page, nom_interne_de_la_fenetre, 
		config='height=400, width=315, toolbar=no, menubar=no, scrollbars=yes, resizable=no, location=no, directories=no, status=no, left='
		+((screen.width - 315)/2) + ",top=" + ((screen.height - 400)/2))
		return true;
}