Transparency Problems

I'm using PhotoShop CS & ImageReady.
I'm trying to make a banner with animations and I'm having tranparency problems.

Here's the scenario:
Problem #1 - Pictures

I'm trying to use two pictures. Pix A to scroll into the banner from the top. <-- I've got no problem doing this
I want to have Pix B to scroll into the banner from the bottom. <-- Here's where the trouble starts
When I tried to test the animation, Pix A works all right. Then when Pix B scrolls in, even when I've placed the picture on a transparent background, it turns out haywired. Same problem when it comes to the text I wanna add.

What went wrong?