Ohh web design bugs me so much sometimes!
I've noticed for a while that on some of my sites (like Millennium
http://millennium.senshuu.com), once the page finishes loading, there's a weird space between the very top of the content area and the top of the web browser area, where there shouldn't be one. (This happens for most of my layouts that are designed to always touch the very top of areas.) Like, the space pops in as soon as the page finishes loading.
I'm thinking there's some kind of Javascript code I'm using that might be causing this, because it didn't always happen. Also, when you navigate to any other page on the site the space goes away and won't come back unless you're just loading up the site in a tab/browser window for the first time.
I know it's not just my PC since it happens in all browsers on any PC, so I'm wondering just what might be causing it and how to fix it. Hurrrm.