The JavaScript Language JavaScript is NOT Java and does NOT have applets although the language resembles Java, but without Java's static typing and strong type checking. JavaScript is a compact, object-based scripting language for developing client and server Internet applications. JavaScript is based on a simple object-oriented paradigm. An object is a construct with properties that are JavaScript variables.
Properties can be other objects.
Functions associated with an object are known as the objects's methods. JavaScript lets you do a lot of things that were previously only available through cgi scripts and other server side programs. JavaScript is not like a Java applet in that it is not used for animations, but it can do useful things such as automatically add and multiply items in a form, for example. It can show the current time. It can put up a welcome window like you just saw.