Improving the scroll (including overflown div's)

[lamuzzachiodi]

This is the pull request for the issue #76:

(...) i see some cosmetic issues related to promp position and the scrolling:
1) scroll top: i've found fails in the overflown div's when the window isn't maximized. Sometimes the promt showed isn't the first : though the scroll for an overflown div works ok, the first prompt would be hidden because the lack of compensation with the window's scroll.
2) scroll left: as the top case, with the difference that is the same for overflown or not div's. Sometimes, the window's scroll, hidde partial o totally the prompt.
(...)
Then, this changes will keeps visible the prompt don't matter its position or the size of the windows.
I've tested it on FF4 and IE8.

Alejandro

[orefalo]

sorry about the delay. thank you for your contribution.