I need to change parts of the content on a web page without re-loading the page. I have heard that AJAX is all about doing just that... Sooo.. What is AJAX (I know Asychronous Java And XML) but that's just words. Is it Javascript? Where can I go to learn how to do what I need to do? and by learn I mean find code snippets that work, adapt them. use them 
Oh.. and what is DOM and do I need to care if I plan on using PHP / SQL to retrieve dynamic info?
Oh.. and what is DOM and do I need to care if I plan on using PHP / SQL to retrieve dynamic info?