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function oNumero(numero){
      //Propiedades 
      this.valor = numero || 0
      this.dec = -1;
      //Métodos 
      this.formato = numFormat;
      this.ponValor = ponValor;
      //Definición de los métodos

function ponValor(cad){
if (cad =='-' || cad=='+') return
if (cad.length ==0) return
if (cad.indexOf('.') >=0)
    this.valor = parseFloat(cad);
else 
    this.valor = parseInt(cad);
} 
function numFormat(dec, miles){
    var num = this.valor, signo=3, expr;
    var cad = ""+this.valor;
    var ceros = "", pos, pdec, i;
    for (i=0; i < dec; i++)
    ceros += '0';
    pos = cad.indexOf('.')
    if (pos < 0)
        cad = cad+"."+ceros;
    else{
    pdec = cad.length - pos -1;
    if (pdec <= dec){
        for (i=0; i< (dec-pdec); i++)
          cad += '0';
        }else{
          num = num*Math.pow(10, dec);
          num = Math.round(num);
          num = num/Math.pow(10, dec);
          cad = new String(num);
        }
    }
  pos = cad.indexOf('.')
  if (pos < 0) pos = cad.lentgh
  if (cad.substr(0,1)=='-' || cad.substr(0,1) == '+')
       signo = 4;

  if (miles && pos > signo)
      do{
          expr = /([+-]?\d)(\d{3}[\.\,]\d*)/
          cad.match(expr)
          cad=cad.replace(expr, RegExp.$1+','+RegExp.$2)
      }
      while (cad.indexOf(',') > signo)
        if (dec<0) cad = cad.replace(/\./,'')
        return cad;
  }

}//Fin del objeto oNumero: