I cannot find out what I am doing wrong. So far, I have tested this only in Internet Explorer, so it could be that Firefox and Chrome aren't parsing the code properly.
http://ontwikkelomgeving.wijzijnblits.nl/ginkelbemmelen/luuk/
My problem is that the bxSlider on the page will start approximately 20px to the right. I do not define this (as far as I know) so I don't know why this is happening. If you click the 1 button, then it slides to the right place.