Ok, so I have a div, #container, with an img #pointer positioned inside of that. #pointer is set to be positioned absolutely. Now, when I let it animate, it works fine in Firefox. I guess the position is being translated into pixel values and everything works. Now, when viewing this in IE (7), the animation works, but before the animation starts, the #pointer is being moved to a wrong place (it jumps to some, always the same position) and the animation starts from the wrong starting point.

When top: 50% and left: 50%, it looks in IE as if he would put it roughly in 60% and 60% instead. When using some pixel value it works properly.