When defining something like a background image URL in a CSS file, when using a relative URL, where is it relative to? For example:
Suppose the file /styleshe
/styleshe
It's relative to the stylesheet, but I'd recommend making the URLs relative to your URL:
div#header { background-image: url(/images/header-background.jpg); }
That way, you can move your files around without needing to refactor them in the future.