function show_news(a){
 if(a == '1' || a == '3'){
  document.getElementById('news_last').style.display = 'none';
 } else {
  document.getElementById('news_last').style.display = 'block';
  if(a == '2'){
   loadnews();
  }
 }
}

  function loadnews() {
   var url="news_last.php";
   if(url.indexOf("?") == -1){
    url = url + "?ie=" + new Date().getTime();
   } else {
    url = url + "&ie=" + new Date().getTime();
   }
    new Ajax.Request(url,
    {
     method:'GET',
     encoding: 'ISO-8859-1',
     onLoading: function(){
       $('news_last').innerHTML='';
       $('news_load').style.display='block';
      },
     onSuccess: function(empfang){
       $('news_load').hide();
       $('news_last').innerHTML=empfang.responseText;
     },
     onFailure: function(){
       $('news_load').hide();
       $('news_last').innerHTML='Seite konnte nicht geladen werden!';
     }
     }
    );
   }