//*********************************************************************************************//
  //************************** UTILIZADO PARA LA MASCARA ****************************************//
  //************************** Yamil Vanegas (Xolo S.A.) ****************************************//
  //*********************************************************************************************//
  //*** Solamente hay que agregar el evento siguiente al TextArea: onfocus="textAreaFocus(this,N);"
  //*** Donde N es la cantidad de caracteres a permitir

  var sBrowser;
  var sVersion;
  var longitud;

  //Para todos (saber el tipo de navegador)
  function setBrowserType() {
      var aBrowFull = new Array("opera","msie","netscape","gecko","mozilla");
      var aBrowVers = new Array("opera","msie","netscape","rv","mozilla");
      var aBrowAbrv = new Array("op","ie","ns","mo","ns");
      var sInfo = navigator.userAgent.toLowerCase();

      sBrowser = "";
      for (var i = 0; i < aBrowFull.length; i++) {
          if ((sBrowser == "") && (sInfo.indexOf(aBrowFull[i]) != -1)) {
              sBrowser = aBrowAbrv[i];
              sVersion = String(parseFloat(sInfo.substr(sInfo.indexOf(aBrowVers[i]) + aBrowVers[i].length + 1)));
          }
      }
  }

  function textAreaFocus(input,longi) {
      //Conociendo el tipo de navegador
      setBrowserType();
      //Estableciendo longitud
      longitud = longi;

      if (sBrowser == "ie") { //Internet Explorer
          input.onkeypress = keyPressIE;
          input.onkeydown = keyDownIE;              
      } else if (sBrowser == "mo") { //Mozilla Firefox
          input.onkeypress = keyPressMO;
      }      
  }

  //Para Internet Explorer
  function keyPressIE(evento) {      
      if (this.value.length + 1 > longitud) {
	  window.event.keyCode = 0;
      }
  }

  //Para Internet Explorer
  function keyDownIE(evento) {
      var whichCode = event.keyCode;
      if (whichCode == 35 || whichCode == 36 || whichCode == 37 || whichCode == 38 || whichCode == 39 || whichCode == 40 || whichCode == 8 || whichCode == 46) {return true;}
      
      if (this.value.length + 1 > longitud) {
	  return false;
      }
      return true;
  }

  //Para FireFox
  function keyPressMO(evento) {
      var key = evento.keyCode;
      if (key == 35 || key == 36 || key == 37 || key == 38 || key == 39 || key == 40 || key == 8 || key == 46) {return true;}

      if (this.value.length + 1 > longitud) {
	  return false;
      }
  }