function Employee() {
  this.dept = "HR";
  this.manager = "John Johnson";
}

function printProp() {
  var Ken = new Employee();
  alert(Ken.hasOwnProperty("manager"));
}

People who read this tip also read these tips:

• Iterating over an Object's Properties
• Playing Multiple Tracks
• Fading a Flash Sound
• Using the System.Console Class
• The Object object