It has to deal with file paths and the relative path. 

We've all seen "../" when we want to go up 1 directory.  My problem was

"images/background-images/" is not the proper path for 100% absoluteness with any URL doing a Server.MapPath.  I need "/images/background-images/".

Warning:  Content most people won't care about but should

When doing a Server.MapPath, the server thinks you're currently in a virtual path of your URL.  So if I'm at http://localhost/archives/2007/article.aspx  and do a Server.MapPath("images/");  I'm going to get back C:\pathToWebApp\archives\2007\images\ in return.

NOW if I did Server.MapPath("/images/");  I'd get back C:\pathToWebApp\images\

Make sense?  Ready ... break.