function getRequest(){
        try {
                return new ActiveXObject("Microsoft.XMLHTTP");
        } catch(e) {
                return new XMLHttpRequest();
        }
}

function getAvailable() {
        var form = document.forms['res1'];

        if(form.elements["periode"].value != '0' && form.elements["duur"].value != '0'){
                r.open('get', 'files/nl/getavailable.php?b='+ form.elements["bungalow"].value +'&d='+ form.elements["duur"].value +'&p='+ form.elements["periode"].value +'&h='+ form.elements["huisdieren"].value +'&round='+ Math.floor(Math.random()*99), true);
                r.onreadystatechange = httpResponse;
                r.send(null);
        }
}

function httpResponse(){
        if (r.readyState == 1)
                document.getElementById('available').innerHTML = "<center><br><br><br><br><font size='2' family='Arial'><i>Gegevens worden geladen...</i></font></center>";

        else if (r.readyState == 4 && r.status == 200){
                if(r.responseText != "")
                     setTimeout('document.getElementById(\"available\").innerHTML = r.responseText', 250);
                else
                     document.getElementById("available").innerHTML = "<center><br><br><br><br><font size='2' family='Arial'><i>Er zijn geen bungalows gevonden...</i></font></center>";

        }
}
var r = getRequest();