Similarly, a Web page button is an object, but myCalculateButton is an instance. Methods are implemented just like functions, but they're always associated with a particular object. Think of methods as verbs. You'll find a list of methods at Netscape's JavaScript reference page . The JavaScript object model comprises all the elements that make up a Web page.
Objects are typically nouns.
For example, window, document, and image are all JavaScript objects. For example, length, name, and target are all JavaScript properties. In JavaScript, an object's properties are defined by using the object's name, a period, and the property name. Furthermore, an object can contain other objects. Check out Netscape's JavaScript reference page for a list of available properties.