Hi.

I just upgraded from 5.5.2.1 to 5.6.0.2 and everything seemed to go just fine but then I got this strange "is a null" popup error message when reloading/refreshing the homepage. The message does not appear on any other page. Any suggestions how to fix this? Clearing the cache does not help.
Check it outhttp://www.sotkamonampujat.net/...

Edit:
This message is given by Firefox, Opera gives different message: Cannot convert 'a' to object. And IE says something about offsetWidth.