var xmlhttp;
//http request starten
function getData(kategorie, preis, wohnflaeche) {
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null) {
  		alert ("Browser does not support HTTP Request");
  		return;
  	}
    var url="fileadmin/res/httpRequest.php";
    //alert("?kategorie="+kategorie+"&preis="+preis+"&wohnflaeche="+wohnflaeche);
	url=url+"?kategorie="+kategorie+"&preis="+preis+"&wohnflaeche="+wohnflaeche;
    url=url+"&sid="+Math.random();
	xmlhttp.onreadystatechange=stateChanged;
    xmlhttp.open("GET",url,true);
    xmlhttp.send(null);
}

function stateChanged() {
	if (xmlhttp.readyState==4){
		document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
	}
}
function GetXmlHttpObject() {
	if (window.XMLHttpRequest) {
  		// code for IE7+, Firefox, Chrome, Opera, Safari
  		return new XMLHttpRequest();
  	}
	if (window.ActiveXObject) {
  		// code for IE6, IE5
  		return new ActiveXObject("Microsoft.XMLHTTP");
  	}
	return null;
}