function ShowVentana(WND, destino, ancho, alto, NombreV)
{
  if (ancho<=0)
    ancho=screen.width;
  if (alto<=0)
    alto=screen.height-75;
  paramet="width="+ancho+",height="+alto+",status=0,location=0,scrollbars=no,top=-1000,left=-1000"; 
  if (WND)
    WND.close();
  WND=window.open(destino,NombreV,paramet);
  WND.moveTo(Math.round((screen.width-ancho-10)/2),Math.round((screen.height-alto-30)/2));
  return WND;
}

function ShowVentanaScroll(WND, destino, ancho, alto, NombreV)
{
  if (ancho<=0)
    ancho=screen.width;
  if (alto<=0)
    alto=screen.height-75;
  paramet="width="+ancho+",height="+alto+",status=0,location=0,scrollbars=yes,top=-1000,left=-1000";
  if (WND)
    WND.close();
  WND=window.open(destino,"WNDtasasur",paramet);

  WND.moveTo(Math.round((screen.width-ancho-10)/2),Math.round((screen.height-alto-30)/2));
  return WND;
}