function expand(id, opac) {
	var element = document.getElementById(id);
	var staat = element.style.display;
	
	if (staat == "none") {
		staat = "";
		if (opac) {
			var main = document.getElementById("main");
			main.style.opacity = "0.2";
		}
	}else{
		staat = "none";
		if (opac) {
			var main = document.getElementById("main");
			main.style.opacity = "1.0";
		}
	}
	element.style.display = staat;
}

function foldout(id) {
	var element = document.getElementById(id);
	var staat = element.style.display;

	staat = "";

	element.style.display = staat;
}

function collapse(id) {
	var element = document.getElementById(id);
	var staat = element.style.display;

	var main = document.getElementById("main");
	main.style.opacity = "1.0";

	staat = "none";
	element.style.display = staat;
}