function machweg(divname) {	
	var zeig = document.getElementById("mainText").getElementsByTagName("a");
	for (i=0; i<zeig.length; i++) {
		zeig[i].style.display = "block";
	}   

	var e = document.getElementById(divname);
  if (!e) return true;
  if (e.style.display == "none") {
    e.style.display = "visible";
  } else {
    e.style.display = "none";
  }
  return true;
}