To add pages: 1) go to bottom of file (around line 1293) and copy the Page 3 code to make new page 2) in each current page, and new page, make sure you add an additional menuTarget (around line 1229 (eg. { x: 3, y: 2 },)) 3) around line 1202 copy and add new page (eg { html: '5', target: ...

that JS may be in the header of the HTML too

Have you found the image directory yet? You can change the images there and keep the same name or you look in one of the JS files and change the image name.