The background images
The TRUE 'background' image of this layout is the AHS logo on the lower lefthand side. You can replace it, but as to size, just make it something small if you want it to be in the corner as it is here. No larger than 250px height by 500px width should be good, but every monitor will be different.
The secondary background image is the image of Tate. Scroll back up in Like to Meet and you will see backimg div class with the background-img:url() style. The image in this section is 500px width by 500px height.
Control Panel images & Connection Images
All of these images are 150px height by 150px width Header1 Header2 Header3 Header4 Header5 Header6 Header7 Header8 Line 1 of lyrics Line 2 of lyrics Line 3 of lyrics Line 4 of lyrics Line 5 of lyrics Line 6 of lyrics Line 7 of lyrics