It looks the same in IE7 and Firefox - when removed the parts that you said the white parts got filled in with little pieces of the background so basically the bg was repeated
you cannot have a "image fill in the entire browser" for one big reasons: you cannot know the user resolution so, you cannot how to resize the image. You can use some javaScript but it does not help you. My recommendation: use an image [at the center] that has a gradient and you'll give the fullScreen illusion with a fade.
If you want to use JS it's not so complicate but some browsers have a different display zone of the page and you cannot know this too... so, center and gradient or... make a nice border and put a bg, like me
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