Object.prototype.inheritFrom = function (fnClass) {
  
      function inheritClasses(fnClass, arrClasses) {
          
          arrClasses.push(fnClass);
  
          if (typeof fnClass.__superclasses__ == "object") {
              for (var i=0; i < fnClass.__superclasses__.length; i++){
                  inheritClasses(fnClass.__superclasses__[i], arrClasses);
              }
          }
      }
      
      if (typeof this.constructor.__superclasses__ == "undefined") {
          this.constructor.__superclasses__ = new Array();
      }
      
      inheritClasses(fnClass, this.constructor.__superclasses__);
      
      for (prop in fnClass.prototype) {
          if (typeof fnClass.prototype[prop] == "function") {
              this[prop] = fnClass.prototype[prop];
          }
      }
  };
  
  Object.prototype.instanceOf = function (func) {
  
      if (this.constructor == func) {
          return true;
      } else if (typeof this.constructor.__superclasses__ == "object") {
          for (var i=0; i < this.constructor.__superclasses__.length; i++) {
              if (this.constructor.__superclasses__[i] == func) {
                  return true;
              }
          }
          return false;
      } else {
          return false;
      }
  };