Hello, that's a recurrent problem, I apologize. I said to Klaus that a new website have to be done, hopefully inthe first half of 2016, current website has also corrupted in some ways.
Still, when issues started with menu and finding a solution was not that easy (depending in browser, adjustments, OS) I better added a drop down menu that you can find on lower right corner.
Next vesion will be done with a software I have used for some time and works fine across platforms, OS, browsers.
Sorry for the inconvenience.