QScrollBar background image

[Alundra]

Hi all,
I try to have a scrollbar like this post :
http://www.qtcentre.org/threads/2790...-of-QScrollBar
but on this post, the solution posted was not the good way.
Is it possible to achieve it correctly ? Can you say me a good way ?
I tried background-image on the stylesheet but I don't see the image on the scrollbar.

QScrollBar:vertical
{
  background-image: url(Line.png);
  width: 15px;
  margin: 0px;
  border: none;
}

QScrollBar:vertical
{
  background-image: url(Line.png);
  width: 15px;
  margin: 0px;
  border: none;
}

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Thanks for the help