g1smd - 10:10 am on Dec 9, 2012 (gmt 0)
What does it actually do? Is it the images don't appear at all? Are the images in the wrong order? Are they not appearing as a cube, but in a line across or down the screen? Is it that some images appear and some don't? Is it that all of the images don't change on mouseover? Is it that some of the images don't change on mouseover? Is it that one of the images doesn't change? Is it that one or more of the links doesn't work when clicked? As I said, "not working" is a description that offers no clues as to what the problem is.
How does what happens differ from what you expected? Have you run the code through the W3C HTML validator? What browser and version are you testing on?
With just a visual look it is clear that you have problems with quotes. Some are different types and there are different amounts around some items.