jLib - JavaScript Library
jLib has moved to assembla!
You should have basic knowledge about HTML and JavaScript, to use this library. If you don't know what DOM is, check it before proceeding 
Here's the article about it in wikipedia: Document_Object_Model
What's jLib?
jLib is small and fast JavaScript library that Do the job. Basically, it's only purpose is to change multiple DOM elements at once, providing simple, easy to use and understand way, and powerful element matching. With this library you can easily set attributes to tags matching specified class, tag type or identificator. Or combination of the above, say, tag.class or tag#identificator.
jLib is licenced under the BSD-like licence. You must agree with the terms of licence agreement if you want to use this software!
Why using it?
There are several reasons. First of all, it's small. Size is around 80 lines of code (as of time of writing), which is around 2 kilobytes. It can be further squeezed, by removing whitespace, code formatting etc.
Second, it's extremely customizable. After all, it does not have anything that directly operates on DOM elements. You can't use it to just animate() your HTML. What it does, is providing very, very nice and easy to use plugin system, that will allow you to operate on tags in the way you want. I will also publish several plugins, from which you can choose from, to perfectly fit your needs, while saving bandwidth, time and nerves.