javascript objects are not born equal

  var obj1=new Object();
  var obj2=new Object();
  document.write("obj1==obj2?"+(obj1==obj2));
  document.write("<br/>obj1, type="+typeof(obj1)+" value: "+obj1);
  document.write("<br/>obj2, type="+typeof(obj2)+" value: "+obj2);
  var bothequal=typeof(obj1) == typeof(obj2) && (obj1==obj2);
  document.write("<br/>are typeof and value the same? "+bothequal);
  document.write("<br/>obj1===obj2?"+(obj1===obj2));

    function MyObjectType(id) {
      this.id=id;
    }
    MyObjectType.prototype.valueOf=function() {return this.id;}
    var object1=new MyObjectType(8);
    var object2=new MyObjectType(8);
    
    document.write("object1==object2? "+(object1==object2));