Thank you for the links, man! This is an example of the window I had in mind:
linkI'll try to work it from there.
Anyway, I'm new to all this JavaScript business and I don't know how to customize these things. So if anyone has done such things before or knows how to do it - any help will be appreciated! Really

This window widget should have the
following characteristics:
- it should stay still where I put it - it shouldn’t move when you scroll down the page (
here is a good example)
- website visitors shouldn't be able to move it
- it shouldn't have visible boarders and X button, just background color