jQuery - modify the prompt/alert functions

Question

I need an advice, if it's worth it to downlaod a jQuery plugin (such as Impromptu), or if it's easier to make my own code just to modify the "prompt" efect. All I need is something like the first example of THIS.

Or is there any other way, how to show a box of text in the midle of the screen, that stays there even when I move scroll and to fade the background a bit, while the box is shown?

Answer 1

If Impromptu has the function you need, why reinvent the wheels?

If you just need a box to show text and be able to do non-modal(ie, just overlay and you can still have the others functional, jqueryUI dialog surely does.