HELP! V_3_gallry_wthumbs dynamic

hallo guys, i’m tryng to make a slideshow with the V3_Thumbs_dynamic.

I’ve problem to to it, can anyone help me in doing this?

I think that it’s a little stupid problem but i do not find out the solution by myself.

Here is the attach

Any suggestion will be useful for me

Thanks in advanced,

:pir: Damiano