function abrirContacto() {
	var ancho = screen.width;
	var alto = screen.height;
	var window_width = 270;
	var window_height = 130;
	var window_left = (ancho - window_width - 12) / 2;
	var window_top = (alto - window_height - 58) / 2;
	popup_contacto = window.open("contacto.html", "popup_contacto", "width=" + window_width + ",height=" + window_height + ",top=" + window_top + ",screenY=" + window_top + ",left=" + window_left + ",screenX=" + window_left);
	popup_contacto.focus();
}

function abrirModelos(pagina) {
	var ancho = screen.width;
	var alto = screen.height;
	var window_width = 480;
	var window_height = 480;
	var window_left = (ancho - window_width - 12) / 2;
	var window_top = (alto - window_height - 58) / 2;
	popup_modelos = window.open(pagina, "popup_modelos", "width=" + window_width + ",height=" + window_height + ",top=" + window_top + ",screenY=" + window_top + ",left=" + window_left + ",screenX=" + window_left + ",scrollbars=yes");
	popup_modelos.focus();
}