I have no idea why this is happening, but take a look at this page:
http://stadsaktuellt.nu/index.php?option=com_eventlist&view=categoryevents&id=14&Itemid=3
The wide banner at the top of the page (in the center horizontally) has a link around it (take a look at the source), but for some reason, it is not always clickable.
It does not work in Linux FireFox 3.6.6, but it does work in Linux Chrome.
Is this a common problem? How would I go about fixing this?