Interesting presentationt's for students to learn jQUERY,AJAX,CSS,PHP,JAVASCRIPT

i know as long long time u are waiting for this type of tutorials, by a simple presentation u can able to understand,learn all scripting languages here..the below list includes,ajax,how to write modular css, about java script libraries, jquery

AJAX:
Introduction to programming with Ajax. Covers XMLHttpRequest, XML, JSON, JavaScript, HTML, CSS, Dom Scripting, Event Handling with some examples from YUI library.





JQUERY:
A short introduction to jQuery in particular about functions, collections, grabbing values and chaining.

JAVASCRIPT:
An interesting Overview about the most popular JavaScript libraries (jquery, prototype, Scriptaculous...) for web designers. 

CSS:
A clearly explained modular system that allows you to hide and show CSS rules to specific browsers without the need for extensive hacks or workarounds