function T(params) {
  var Library = function(params) {
    this.version = "0.1";

    var selector = document.querySelectorAll(params);
    var i;
    this.length = selector.length;

    for (i = 0; i < this.length; i++) {
      this[i] = selector[i];
    }

    return this;
  }

  Library.prototype = {
    hide: function() {
      var len = this.length;
      while (len--) {
        this[len].style.display = 'none';
      }

      return this;
    },

    show: function() {
      var len = this.length;
      while (len--) {
        this[len].style.display = 'block';
      }
      return this;
    }
  }

  return new Library(params);

};