<script type="text/javascript">
  function change(img) {
    document.images[3].src = '../images/'+ img +'.jpg';  
  }

  function chgtext(mNum) {
    var Messages = new Array (
    "Testtext 1",
    "Testtext 3",
    "Testtext 2", 
    "Testtext 4"
  );
document.getElementById("description").firstChild.nodeValue=Messages[mNum];
//document.all.description.innerHTML = Messages[mNum];
}
</script>

<div id="me">
<p>
<img src="../images/myself.jpg" class="myself_img" alt="Grossansicht" />

<img src="../images/myself_mini.jpg" class="small_img"
onmouseover="change('myself');chgtext(0);" alt="Miniansicht" />

<img src="../images/wir_mini.jpg" class="small_img" 
onmouseover="change('wir');chgtext(1);" alt="Miniansicht" />

<img src="../images/bobby_mini.jpg" class="small_img"
onmouseover="change('bobby');chgtext(2);" alt="Miniansicht" />

<img src="../images/fam_mini.jpg" class="small_img" 
onmouseover="change('fam');chgtext(3);" alt="Miniansicht" />

<span id="description">
Der voreingestellte Standarttext
<br /><br /></span></p>
</div>