<script type="text/javascript">
var XMLHttpRequestObject = null;

try{
    XMLHttpRequestObject = new XMLHttpRequest();
}
catch(e){
  try{
    XMLHttpRequestObject =  new ActiveXObject("Microsoft.XMLHTTP");
  }
  catch(e){
  }
}

function startRequest()
{
  if(XMLHttpRequestObject){
    XMLHttpRequestObject.open("GET", "http://localhost/dane.txt", false);
    XMLHttpRequestObject.send(null);
    if(XMLHttpRequestObject.status == 200){
      tekst = XMLHttpRequestObject.responseText;
      alert(tekst);
    }
  }
}
</script>