// change the names in (content-YOURBUTTONNAME) and (i == "on-YOURBUTTONNAME") for each tab
function toggleTabHeadlines(i) {
	document.getElementById("content-headlines").style.display = (i == "on-headlines") ? "block" : "none";
	document.getElementById("content-features").style.display = (i == "on-features") ? "block" : "none";


// this stays the same
	document.getElementById("tab-headline1").className = i;
}