Help with an image transition using masks

Hi, I’m trying to make a cycling image header for a site using an image transition. I’m really stumped and this seems like it should be quite simple :shifty: here is the mess I have so far:

Basically I want the right side of the image to be the exposed second image, and the little swoosh down the center to be divider between the first and second images. Right now of course it’s not working and it’s just an attempt at a visual to go off of.

I have about eight images and I want the transition between each one, and then to loop the whole sequence. There are no buttons or anything, so I guess I don’t need any action scripting right? I have no idea. I’d like this transition to work and quickly, otherwise I’ll have to do something else. ^^;