I haven't found the problem. However, I can't see yours. I've opened the page in IE6 and clickedo Kommentare but a new page opens and nothing drops.

the problem doesn't occur in IE, only in firefox and safari. opera and IE show it correct (usually it's the other way :) )
it should show up if you click on "Kommentare" or follow this link

sorry wrong link
here is the right one
http://blog.brainsellers.de/articles/blogbrainsellersde#Kommentar

finally found a solution.
http://www.webmasterworld.com/forum83/8516.htm
its in the last post

Use the Error Console under Tools in Firefox.

Use the W3C Validator to check your code.

http://validator.w3.org/

Note that using # in a url causes the page to open at that named anchor.