Fading out, switching pictures, then fading the next one in is very old school. Crossfading is the way to go.
Your definition of slide is also old school. I would expect one to slide to the left while the next is sliding in from the right.
I see that you are using the classic UI effects. I think they are all out-of-date. CSS3 animations and transitions are much more pleasant.
JΛ̊KE