Writing classes in Javascript does not give full functionality of an object oriented language, but it at least gives data hiding http://www.microcyb.com/?m=c&c=333
Concise, to-the-point tutorial on Regular Expressions with sections on more advanced aspects of the feature. http://www.javascriptkit.com/javatutors/redev.shtml
An event handler executes a segment of a code based on certain events occurring within the application, such as onLoad or onClick. http://www.intranetjournal.com/corner/hoque/eh-1.shtml
Prototype is an extremely popular Javascript framework that is quite frankly. http://www.talkphp.com/javascript-ajax-e4x/1395-part-1-getting-started...