function show_umgebung () {
  if (document.getElementById){
	  	document.getElementById("wanderung_button").style.visibility = "visible";
  		document.getElementById("aktivitaeten_button").style.visibility = "visible";
  }
}

function hide_umgebung () {
  if (document.getElementById){
	  document.getElementById("wanderung_button").style.visibility = "hidden";
	document.getElementById("aktivitaeten_button").style.visibility = "hidden";
  }
}


function roll_and_show(arg1,arg2,arg3){
	roll(arg1, arg2);
	if(arg3 == "showUmgebung"){
		show_umgebung();
	}
	
}

function roll_and_hide(arg1,arg2,arg3){
	roll(arg1, arg2);
	if(arg3 == "hideUmgebung"){
		hide_umgebung();
	}
	
}