function chamaCal(campo, bt ) {

    Calendar.setup(
    {
      inputField  : campo,     // ID of the input field
      ifFormat    : "dd/mm/y",      // the date format
      button      : bt,             // ID of the button
      align       : "tR",
      weekNumbers : false,
      singleClick : true
    }
    );
}

function chamaCal2(campo, bt, align ) {

    Calendar.setup(
    {
      inputField  : campo,     // ID of the input field
      ifFormat    : "dd/mm/y",      // the date format
      button      : bt,             // ID of the button
      align       : align,
      weekNumbers : false,
      singleClick : true
    }
  );
}