Before we get into object construction, a quick primer for all those of you who are new to the weird and wonderful world of objects.
Every object constructed from the template has certain characteristics, or "properties", and certain pre-defined functions, or "methods". These properties and methods of the object correspond directly with the variables and functions within the object definition.
But there are situations where you need to spawn more than one instance of an object - for example, multiple menu trees, multiple image swaps, or multiple ticker tapes (you'll see multiple Calendar objects a little further down). In such a situation, objects are preferred, since each instance comes with its own variables and functions, and thus can be manipulated without affecting other variables within the program.
Objects also help you keep your code modular - you can define an object constructor in a separate file, and include that file only in the pages where you plan to use the object - and simplify code changes, since you only need to edit a single file to add new functionality to all your spawned objects.