function show(index){ 
  document.getElementById(index).style.display = "block";  
  document.getElementById("transparent").style.display = "block";    
  document.getElementById("transparent"+index).style.display = "block"; 
  document.getElementById("close"+index).style.display = "none"; 
} 
function hide(){ 
  document.getElementById(2).style.display = "none";  
  document.getElementById(3).style.display = "none"; 
  document.getElementById(4).style.display = "none";
  document.getElementById(8).style.display = "none";
  document.getElementById("transparent").style.display = "none"; 
  document.getElementById("transparent2").style.display = "none"; 
  document.getElementById("transparent3").style.display = "none";     
  document.getElementById("transparent4").style.display = "none";
  document.getElementById("transparent8").style.display = "none";    
}


/*Zahlen ersetzen 1,2,3,7 -> 2,3,4,8*/