function Popup_prefixe() {
	width_="450"; height_="700";
	features_="width="+width_+", height="+height_+", left="+((screen.width-width_)/2)+", top="+((screen.height-height_)/2)+", toolbar=no, menubar=no, location=no, scrollbars=yes, status=no, resizable=yes, fullscreen=no";
	newPopup=window.open("prefixe.html","",features_);
	}