It does seem like a really strange error. I'm not used to background images giving you this much trouble. Although they do look almost identical on my box. Is it possible there's some other configuration issues on your machine? Firefox displays one black line, one white line, etc. all the way down the page. IE is inserting an extra line of white pixels at the bottom of each image, creating a noticeable white band about every quarter inch. But otherwise they look the same here. So maybe it's not really a problem. How does it look to anyone else?
If there is a problem, my bet would be on the javascript. DOM support is a little iffy in IE, and you may be running into some problems with the image display for that reason. Not because the background image is your real problem. That's the spot that looks more ripe for cross-browser incompatibility to me.
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