var xmlHttp = new XMLHttpRequest();

function searchresult() { 
  var name = document.suche.keyword.value;
  var url = "http://www.vfb-holsen.de/suche.php?keyword=" + escape(name);
//  var url = "http://localhost/vfb/suche.php?keyword=" + escape(name);
  xmlHttp.open("GET", url, true);
  xmlHttp.onreadystatechange = updatePage;
  xmlHttp.send(null);
}

function updatePage() {
  if (xmlHttp.readyState == 4) {
     var response = xmlHttp.responseText;
     document.getElementById("result").innerHTML = response;
  }
}