var ventana2=0;
function ventana(url,w,h)
{
	
	if(ventana2)
  	{
    if(!ventana2.closed) ventana2.close();
  	}
	 x = (screen.width - w) / 2;
	 y = (screen.height - h) / 2;

	ventana2 = open(url, "ventana2", "height=" + h + ",width=" + w + ",top=" + y + ",left=" + x + ",scrollbars=no,status=no,toolbar=no,menubar=no,location=no")
}

var ventana3=0;
function ventana_2(url,w,h)
{
	
	if(ventana3)
  	{
    if(!ventana3.closed) ventana3.close();
  	}
	 x = (screen.width - w) / 2;
	 y = (screen.height - h) / 2;

	ventana3 = open(url, "ventana3", "height=" + h + ",width=" + w + ",top=" + y + ",left=" + x + ",scrollbars=yes,status=no,toolbar=no,menubar=no,location=no")
}