var resObjekt;
if(navigator.appName.search("Microsoft") > -1){
  resObjekt = new ActiveXObject("MSXML2.XMLHTTP"); 
}
else{
  resObjekt = new XMLHttpRequest();
}

function sndReq() {
  tour = document.search.tour.value;
  typ = document.search.typ.value;
  kat = document.search.kat.value;
  datvon = document.search.datvon.value;
  datbis = document.search.datbis.value;
  leiter = document.search.leiter.value;
//resObjekt.open('get', 'overview.php?tour='+tour+'&typ='+typ+'&kat='+kat+'&datvon='+datvon+'&datbis='+datbis+'&leiter='+leiter,true);
//  resObjekt.open('get', 'tb_grid.php?tour='+tour,true);
  resObjekt.open('post', 'tb_grid.php',true);
  resObjekt.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
  resObjekt.onreadystatechange = handleResponse;
  resObjekt.send('tour='+tour+'&typ='+typ+'&kat='+kat+'&datvon='+datvon+'&datbis='+datbis+'&leiter='+leiter);
}
 
function handleResponse() {
  if(resObjekt.readyState == 4){
	document.getElementById("grid").innerHTML = resObjekt.responseText; 
  }
}