function NextPage(iNext){
      frmAux = document.getElementById("frmPg");
      document.getElementById("pagina").value=iNext;
      frmAux.submit();
    }
    function PrevPage(iPrev){
      frmAux = document.getElementById("frmPg");
      document.getElementById("pagina").value=iPrev;
      frmAux.submit();
    }