OK, no offence, but I think most of the replies are just confusing the OP.
So Cynthia, here is the deal:
There are 2 main “types” of scripting languages that are used on the web:
1. Server-side (eg. PHP, Perl)
This code is executed on the server, and the resulting markup (eg. HTML) is sent to your browser as a web-page. Unless you have access to the server running this code, you have no way of knowing what exactly the code is doing - all you see are the results.
2. Client-side (eg. Javascript)
This code is executed by your browser. You can view the exact code that is being executed because your browser first needs to download it to your local machine and then run it.
There are specific circumstances in which it is better to use server-side code, and specific circumstances in which to use client-side code. Server-side code is generally used to process web forms and to interact with databases on the server. Their main limitation is that they can’t “see” what is happening in your browser until you have submitted some data for the code to process. If you are looking for something more interactive, then client-side code is better, because it can interact with your browser in real time. Nowadays, many applications use both server-side and client-side scripting to get the best of both worlds.
This is by no means an exhaustive explanation, but it should get you started on your way. BTW, AJAX is basically just an extension of Javascript (it stands for Asynchronous Javascript and XML). It is used most notably by Gmail and Google Maps, and gives them that cool interactive feel.
-HTH
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