function showContent(show, hide1, hide2, buttonOn, buttonOff1, buttonOff2) {
	var classoff = "buttonoff";
	var classon = "buttonon";

	document.getElementById(show).style.display = "block";
	document.getElementById(hide1).style.display = "none";
	document.getElementById(hide2).style.display = "none";

	// change classes
	on=document.getElementById(buttonOn);
	on.className=classon;
	off=document.getElementById(buttonOff1);
	off.className=classoff;
	off=document.getElementById(buttonOff2);
	off.className=classoff;
}