Ahhh, ok I understand what you're trying to do now. Put the left: -160px back in there. But the number of pixels you're moving it it should be equal to the width of spider.gif, I'm not sure if thats the case.
Oh! Or are you saying that spider.gif is still slightly left of exact center? If thats so, you'll want to put in spider.gif left: xpx; and in transparent.gif you'll want to put left: -xpx; where x is one half of the width.
Sorry I missunderstood what you were looking for in the second post. Let me paraphrase what you said to see if I understand. You have an area for content, and an area for the footer. You want the footer directly below the content, and when the size of the content area changes you want the footer to move with it so it is still directly below it. Am I on the right track?
is xhtml, which someone else is going to be more qualified to tell you about. Its something about closing all tags to keep all browsers happy....I think.
Let me know how we're doing with this. Take care