Crockford's code concerning the Constructor Invocation Pattern
===

The below code is almost identical to some code from Douglas Crockford's superb book JavaScript: The Good Parts, from pages 29-30. The only difference is that he adds the get_status property like so: 

    Quo.prototype.get_status=function() {
      this.status=string;
    }

My question is why his code runs OK but my little change, below, results in an error that says myQuo has no get_status method?

    <script>
      var Quo=function(string) {
		this.status=string;
      }
      Quo.get_status=function() {
		return this.status;
      }
      var myQuo=new Quo("confused");
      alert(myQuo.get_status());
    </script>