The banner is connected to the forum using a full length url :
example:
http://stylevars/images/logo.png
All the rest of the images are connected to the forum using a relative path
example: url(/images/repeat1.png)
make sense, thats why your logo will always show but your images may not. Just a function of vbulletin. Thats how I know you placed the images folder in the wrong place.