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LABjs (Loading And Blocking JavaScript)

Using LABjs will replace all that ugly " tag soup" -- that is all the tags that commonly appear in the or end of the of your HTML page. The API is expressive and chaining, to let you specify which scripts to load, and when to wait ("block"), if necessary, for execution before proceeding with further execution. The API also easily allows inline code execution coupling (think: inline tags). Loading LABjs dynamically It's been asked several times before: "How would I load LABjs itself dynamically, to save on the blocking load of LAB.js (~2k gzip'd)?" http://labjs.com/
Overview Sample pages using the canvas tag are included with the source code. For more information about the canvas tag, take a look at this tutorial . http://excanvas.sourceforge.net/

ExplorerCanvas

I have developed a JavaScript library that makes it extremely easy to incorporate " comet " or server-push technology into any web application without need for special programming or any special support on the server. Ressources needed on the server are also practically zero. When you use the JavaScript library, you will receive an URI that identifies the client. Now you can make simple HTTP-GET requests to that URI with a message parameter and the client will receive the message immediately. Because only your application will know the un-guessable URI, the client should be save from unwanted messages.

UniversalComet: Make any web page a Comet end point

http://ajaxian.com/archives/universalcomet
Mashing it up with Ajax A mashup is a Web application that integrates content from more than one source and delivers it for presentation in a single page. The server makes requests to each content source, parses the information it receives, and combines the results into a page to send to the browser, as Figure 1 shows. http://www.ibm.com/developerworks/library/x-securemashups/

Shaping the future of secure Ajax mashups

Rectangular Marquee Tool

http://marqueetool.net/ Marqueetool DHTML application is useful for developers who face the challenge of making image selection and coordinates calculation of selected areas. Or if you want to highlight some areas of your picture (for example point out yourself on the photo). With the help of the marquee tool you can easily focus someone's attention to a specific area on the picture.
Try adjusting the browser window so the links in the paragraphs below are as close to the right side of the window as possible. Roll over a link in the paragraphs below. This demonstrates how the tool tip will flip horizontally depending upon the space between the tool tip and the right side of the window. Don't worry the script also accounts for the custom widths. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut Tip With Caption enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. http://www.codylindley.com/blogstuff/js/jtip/

jTip - The Jquery Tool Tip

moo.fx - the next small thing

http://moofx.mad4milk.net/ It's very easy to use , blazing fast , cross-browser , standards compliant , provides controls to modify any CSS property of any HTML element, including colors, with builtin checks that won't let a user break the effect with multiple, crazy clicks. Optimized to make you write the lesser code possible, the new moo.fx is so modular you can create any kind of effect with it. moo .fx is open source, released under the very liberal MIT License , so feel free to do anything you want with it.
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ZK - Simply Rich

http://zk1.sourceforge.net/
http://dojotoolkit.org/

Dojo - DojoToolkit.org

New lightweight kernel Dojo 1.7 is the largest update to the Dojo toolkit since Dojo 1.0. We’ve completely refactored Dojo around a lightweight modular kernel with minimal base dependencies , while retaining with older Dojo versions. Designed to grow with your project and organization