Go to Field[Picture 2]
works or not.
Do you use repetition field, and do you use other field for thumbnail or same field in slide?
I always use object names for the slide panels. I believe this is also the recommended way to navigate.
Set Layout Object Animation [ On ]
Go to Object [ Object Name: "Picture2" ]
This will show the slide animation and move to slide2. Since the object names in the script can be calculated you can use global variables to to keep track of which slide you are on and which one is left or right. There are a few ways to do this and you may want to set the global variable to a default on layout enter. Many people use a forward and back button. I think there are a few sample files floating around here.