Custom mouse-over spoiler BB Code

[Dj SharK]

Hi, I've seen the Inline Hover Spoiler BB Code (https://vborg.vbsupport.ru/showthread.php?t=201700) posted here but i'm looking for one just like they have on IMDB. I'm not really sure how do i go about doing it. Any help please.

Before
105693

Mouse-over
105694

Image
http://www.imdb.com/images/spoilers.gif


Thank you. :)