[TYPO3-dev] Javascript Problem

[Hugo Tonni]

I have got a problem, that I am not able to solve. I have to deal with a typo3 website, that I haven`t made, you can find it at
 www.gys.at/
The header picture should change and behave like a slider. It worked up to 2 month ago. 
The extension is called rotating images. 
I am sure it`s a javascript problem, but I don`t know how to recognize and solve it. I know it works somehow with the firebug tools. It´s a school website, for free and therefore a have no special support.

It would be perfect if anyone could help me. Thanks a lot.

Hugo T.