function GeberaBanner(text) { 

  var countBanner = 17; 
  var randValue = Math.floor(Math.random()*countBanner) + 1; 

  document.write('<div class="ueb ueb'+randValue+'"><h1>'+text+'</h1></div><img src="../bilder/kopf/k'+randValue+'-1.jpg" width="362" height="108" align="bottom" alt="" class="start1" />'); 

}