Top Banner –500x100px (do not go over 100px as it will push WNP content down). Try to keep file size below 150k.
Bottom Banner –500x300px. Try to keep file size below 150k.
Notifications –Images can be any size as long as it doesn’t dominate content. Image file size should not total more than 100k.
WNP –Content including images should not be wider than 600px.
Splash Pages –Page defaults to 800x600. Would try to keep content width at 750px to avoid scrolling.