Hi Nick,
Of course, you’re right, I meant the fixed header. I found the function, changed line 814 to “newH = el_height*0.8;” and the header responds fantastic now!
What I meant with opacity: while scrolling the page moves behind the header, but the page was still vagely visible. But again you are right, it had nothing to do with opacity. Setting the background from #header_main in layout.css to #fff solved that issue.
Thanks a lot for your response!
René