1: 
2: 
3: 
4: 
5: 
6: 
7: 
8: 
9: 
10: 
11:

<a href="javascript:;" onClick="toggleDisplay('faq1')">Frage1</a>
<span id="faq1" style="display: none;">Antwort1</span>

<a href="javascript:;" onClick="toggleDisplay('faq2')">Frage2</a>
<span id="faq2" style="display: none;">Antwort2</span>

..... 

usw.

1: 
2: 
3: 
4: 
5: 
6: 
7: 
8: 
9: 
10: 
11:

function toggleDisplay(id) {
  if (document.getElementById) {
    var e = document.getElementById(id);
    if (e) {
      if (e.style.display !== "") e.style.display = ""
      else e.style.display = "none"
    }  
  }
}

1: 
2: 
3: 
4: 
5: 
6: 
7: 
8: 
9: 
10: 
11: 
12:

function toggleAll() {
 var x = document.getElementsByTagName('span');
 for (var i=0;i<x.length;i++)
 {
  if (x[i].className == 'answer') {
     if (x[i].style.display !== "") x[i].style.display = ""
          else x[i].style.display = "none"
  }
 }
}