Opera rendering/display issues at scroll

[therapiekind]

Hey there,

I build a somewhat simple scroller using JavaScript. It works fine with Firefox and Internet Explorer, but Opera has some problems with the content to be scrolled. It doesn't "screen-refresh" portions of the content.

I have uploaded an image to better explain what's going on:
http://typeofundefined.com/stuff/talwild/opera.png

The site can be found here; CSS is linked, JS can be found directly in the html file:
http://typeofundefined.com/stuff/talwild/talwild.htm

My Opera is version 9.00 build 8502, running on WinXP Pro.
Thanks in advance for any helpful answers!