Overpaint pictures

[tcheguevara]

Ok so i am new to QT and i am having some problems with something like this:
!http://postimg.org/image/hbsa17bin/()!

(A scrollbar with the handlers like images)

But when i scroll them one through the other what happens is:

!http://postimg.org/image/ayc6xbnst/()!

Is there anyway to not over paint the sad face over the happy one?