function valida(form,field) {

	rut_val = document.forms[form].field.value;

	if ( rut_val.length == 0 ) 

	{

	    alert( "Debe ingresar su R.U.T.");

	    return;

	}

	if ( !checkRutField(rut_val) )

	{	

	    return;

	}

	var tmpstr = "";	

  	for ( i=0; i < rut_val.length ; i++ )

    	if ( rut_val.charAt(i) != ' ' && rut_val.charAt(i) != '.' && rut_val.charAt(i) != '-' )

      		tmpstr = tmpstr + rut_val.charAt(i);

  	rut_val = tmpstr;  

    rut_valor = rut_val.substring(0,rut.length);

  	

	document.forms[form].frm_rut.value =normalRut(rut_val.substring(0,rut.length));	

	document.forms[form].usuvrtrut.value = rut_val.substring(rut.length,rut.length+1);

	document.forms[form].elements[field].value = "";

	document.forms[form].submit();

}

function normalRut(rut) {
    for (var n=rut.length; n < 8; n++)
        rut = "0" + rut;
    return rut;
}

function checkRutField(rut,form,field,campo)

{

  var tmpstr = "";

  for ( i=0; i < rut.length ; i++ )

    if ( rut.charAt(i) != ' ' && rut.charAt(i) != '.' && rut.charAt(i) != '-' )

      tmpstr = tmpstr + rut.charAt(i);

  rut = tmpstr;

  largo = rut.length;

// [VARM+]

  tmpstr = "";

  for ( i=0; rut.charAt(i) == '0' ; i++ );

  for (; i < rut.length ; i++ )

     tmpstr = tmpstr + rut.charAt(i);

  rut = tmpstr;

  largo = rut.length;

// [VARM-]

  if ( largo < 2 )

  {

    alert("Debe ingresar el rut completo");
	
	return false;

  }

  for (i=0; i < largo ; i++ )

  {

    if ( rut.charAt(i) != "0" && rut.charAt(i) != "1" && rut.charAt(i) !="2" && rut.charAt(i) != "3" && 

rut.charAt(i) != "4" && rut.charAt(i) !="5" && rut.charAt(i) != "6" && rut.charAt(i) != "7" && 

rut.charAt(i) !="8" && rut.charAt(i) != "9" && rut.charAt(i) !="k" && rut.charAt(i) != "K" )

    {

      alert("El valor ingresado no corresponde a un R.U.T valido.");

      return false;

    }

  }

  var invertido = "";

  for ( i=(largo-1),j=0; i>=0; i--,j++ )

    invertido = invertido + rut.charAt(i);

  var drut = "";

  drut = drut + invertido.charAt(0);

  drut = drut + '-';

  cnt = 0;

  for ( i=1,j=2; i<largo; i++,j++ )

    {

    if ( cnt == 3 )

    {

      drut = drut + '.';

      j++;

      drut = drut + invertido.charAt(i);

      cnt = 1;

    }

    else

    {

      drut = drut + invertido.charAt(i);

      cnt++;

    }

  }

  invertido = "";

  for ( i=(drut.length-1),j=0; i>=0; i--,j++ ) {

       ch = drut.charAt(i);
	if (ch=='k') ch='K';

       invertido = invertido + ch;
}

  document.forms[form].elements[field].value = invertido;
 
  if ( checkDV(rut,form,field,campo) )

    return true;

  return false;

}

function checkDV( crut ,form,field,campo)

{

  largo = crut.length;

  if ( largo < 2 )

  {

    alert("Debe ingresar el rut completo.");

    document.forms[form].elements[field].focus();
	document.forms[form].elements[field].select();

    return false;

  }

  if ( largo > 2 )

    rut = crut.substring(0, largo - 1);

  else

    rut = crut.charAt(0);

  dv = crut.charAt(largo-1);

  checkCDV( dv,form,field,campo );

  if ( rut == null || dv == null )

      return 0;

  var dvr = '0';

  suma = 0;

  mul  = 2;

  for (i= rut.length -1 ; i >= 0; i--)

  {

    suma = suma + rut.charAt(i) * mul;

    if (mul == 7)

      mul = 2;

    else

      mul++;

   }

  res = suma % 11;

  if (res==1)

    dvr = 'k';

  else if (res==0)

    dvr = '0';

  else

  {

    dvi = 11-res;

    dvr = dvi + "";

  }

  if ( dvr != dv.toLowerCase() )

  {

    alert("EL rut es incorrecto.");

    document.forms[form].elements[field].value = "";
	document.forms[form].elements[field].focus();

    return false;

  }

      return true;

}

function checkCDV( dvr,form,field,campo )

{

  dv = dvr + "";

  if ( dv != '0' && dv != '1' && dv != '2' && dv != '3' && dv != '4' && dv != '5' && dv != '6' && dv != 

'7' && dv != '8' && dv != '9' && dv != 'k'  && dv != 'K')

  {

    alert("Debe ingresar un digito verificador valido.");

    document.forms[form].elements[field].focus();

    document.forms[form].elements[field].select();

    return false;

  }

  return true;

}