Prototype is an extremely popular Javascript framework that is quite frankly. http://www.talkphp.com/javascript-ajax-e4x/1395-part-1-getting-started...
As an extension to Wildhoneys introductory article on JavaScript, I have written this article to show how to achieve the same results . http://www.talkphp.com/javascript-ajax-e4x/1415-part-2-using-prototype...
Generating an autocomplete dropdown list for textboxes using the Prototype javascript library, along with PHP and MySQL. http://www.talkphp.com/advanced-php-programming/1588-auto-suggest-usin...
Learn about session-only cookies in JavaScript, and how they can help your scripts retain information even after the page is reloaded or cleared. http://wsabstract.com/javatutors/cookie.shtml
Using cookies, this script records the date+time of your visitors last visit and displays it upon their return. http://www.javascriptkit.com/script/script2/lastvisit.shtml
Use a few simple lines of JavaScript to verify if cookies are accepted by the target web browser. http://www.devpub.com/determine-if-cookies-are-enabled-t3.html