For this layout, the images were encased in picbox divs to resize them. We have JavaScript for randomly loading image in middle position. There is a different random script below this (which will not load if anything else is on same line).
This sample demo page is indexRandom.html#top (cannot get 3 sets at different positions to work at indexRandom3.html#top). See index.html#top for regular version. See also indexCol.html (which has columns), indexRow.html (which has columns and rows), index.htm (which features a Javascript slideshow), indexTable.html (experimenting with image sizing and positioning), and indexCSS.html (another CSS layout).