Ah, right. I did see it eventually, but I recommend you rethink this. You will lose a lot of visitors who don't know what to do with that page. The Enter link is tiny and hard to see, depending on where the link appears over the background. Intro pages like this kind of went out a long time ago, and with good reason, I think. Why not just have that intro at the top of the page, along with the other content?
Anyhow, to the issue at hand: I've looked quite a bit and can't see why the page is jumping to that spot, but it happens in every browser for me. It's not JS that's causing it, as I've tired with that turned off. :-/