1. Images appear as boxes with X in them
Solution: Make sure you've uploaded the images and the images listed in the HTML file refer to the correct locations of the images. If you have uploaded it all and it hasn't worked, check the HTML file that your images are refering to those on your site, and not your harddrive.
2. Javascript effect doesn't work
Solution: If this is the case, you will see ERROR ON PAGE on the status bar and the thing just won't work. If this is the case, you might need to send a link to the problem page, so that it can be looked at to help you fix it.