function toogleSlide(topicsId,imgId) {
  if(document.getElementById(topicsId).style.display != "none") {
  	document.getElementById(topicsId).style.display = "none";
  	document.getElementById(imgId).src = "/_img/Mehrbuttonplus.gif";
  }
  else {
  	document.getElementById(topicsId).style.display = "";
	document.getElementById(imgId).src = "/_img/Mehrbuttonminus.gif";
  }
}