===double underscore means '`__`'=== `__` is the only global namespace used by this library. ==why there is another library?== * all most all javascript library do things such as array utilities, string utilities, DOM, Event, Animation, Drag & Drop, widgets, browser compatibilities, layout...

yui-form-validator is a javascript html form validator based on Yahoo User Interface (YUI) form validation could be achieved by configuration, no need to write validation javascript for every input element！ @Author *stauren@stauren.net* It's a YUI extention. Check out this example: [http://s...