Mjlib is a project mainly written in JavaScript, it's free.
mjlib - javascript library - currently under development.
mjlib is a simple utility library
Current features:
MJLIB is MIT Licensed
Copyright (c) 2011 Michał Jezierski [ambinanitelo (at) g m a i l (dot) c o m]
$('.className') vs MJ.getElementsByClassName(root, 'className')
$(el).toggleClass('className') vs MJ.toggleClass(el, 'className')