I would like to add (with as minimal change to a page as possible) the ability to display a pop-over (i.e. not an actual OS dialog, but part of the page) message box on my homepage that I can call with javascript.
In the worst case I suppose I could resort to the alert() call, but I find these annoying and obtrusive and just want something unobtrusive that will only affect the page.
Something like those pop-over picture boxes you see, but for text, maybe with a headline or something and a close box or 'OK' button.
I tried searching for it, but all I can find are tutorials on using javascript alert().
Update: I just found this question, which has some good links.