Compressed and uncompressed copies of jQuery files are available. The uncompressed file is best used during development or debugging; the compressed file saves bandwidth and improves performance in production. Starting with jQuery 1.9, we also make available sourcemap files that can be used to debug the compressed file in sourcemap-aware browsers such as Google Chrome. The map file is not required for users to run jQuery, it just improves the developer's debugger experience. To locally download these files, right-click the link and select "Save as..." from the menu. The jQuery 1.x line had major changes as of jQuery 1.9.0.
Instantly Better Web Apps Dojo saves you time and scales with your development process, using web standards as its platform. It’s the toolkit experienced developers turn to for building high quality desktop and mobile web applications. From simple websites to large packaged enterprise applications whether desktop or mobile, Dojo will meet your needs. Internet Explorer 6-9 Firefox 3.6+
Why YUI? Fast YUI's lightweight core and modular architecture make it scalable, fast, and robust.
hSlides jQuery plugin