var ajax_target_id;
var ajax_callback_function;

function erzXMLHttpRequestObject(){
  var resObjekt = null;
  try {
    resObjekt = new ActiveXObject("Microsoft.XMLHTTP");
  }
  catch(Error){
    try {
      resObjekt = new ActiveXObject("MSXML2.XMLHTTP");
    }
    catch(Error){
      try {
      resObjekt = new XMLHttpRequest();
      }
      catch(Error){
        alert("Erzeugung des XMLHttpRequest-Objekts nicht möglich");
      }
    }
  }
  return resObjekt;
}
resObjekt = erzXMLHttpRequestObject();

function sndReq(value,ajax_query_file,callback_function) {
    if(callback_function!='')ajax_callback_function=callback_function;
    resObjekt.open('get',ajax_query_file+'&value='+value,true);
    resObjekt.onreadystatechange = handleResponse;
    resObjekt.send(null);
}

function handleResponse() {
  if(resObjekt.readyState == 4){
   var Satz = resObjekt.responseText;
   if(typeof window[ajax_callback_function] == 'function') window[ajax_callback_function](Satz);   
  }
}