CS2 help needed

Hello, I've been using Photoshop Elements 5.0. I now also have CS2(2005 or 6). I'm having a problem merging images. On Elements 5.0 I have my main image/layer and my second,(third, etc) image is placed at the bottom of the screen. When I'm ready to merge the two images I simply grab the image at the bottom and place it on top of my first layer. The problem is I can't figure out how to do this on CS2. If I open more than one image it comes up as a separate window and I can't place/merge them together. Anyone know what I'm doing wrong here? Thanks!

With both images open and visible, simply select the move tool and drag one image into the other images window... the image will be placed on a layer above the original.

Yes, great! Thank you very much!