Do you keep your own javascript "standard lib"?

And if so, what is in it?

What I mean is a .js file full of functions that you commonly use, and include in every project. Right now, I'm building myself one, and so far have stuff like:

A basic function for loading an external JSON.

A function called "modal", pops a jquery superbox.

A function called "chomp", which removes trailing newline characters from a string.

What I'd really love, however, is to also be able to include an "init" function that:

A) Loads necessary "helper" js, like jquery, jquery-ui

B) Loads necessary "helper" css, like css for jquery-superbox