You've an onload conflict, replace:
Code:
window.onload=fillup;
with:
Code:
if (window.addEventListener)
window.addEventListener('load', fillup, false);
else if (window.attachEvent)
window.attachEvent('onload', fillup);
For your arrow images, you can do something like so:
Code:
<img onmouseover="scrollspeed=2;moveright();" onmouseout="scrollspeed=0;" src="img/pijltje_links.gif" alt="links">
and:
Code:
<img onmouseover="scrollspeed=2;moveleft();" onmouseout="scrollspeed=0;" src="img/pijltje_rechts.gif" alt="rechts" width="42" height="186">
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