[HaBo]

<form name="support" method="post">
   <input type="text" name="name">
   <input type="text" name="mail"> 
   <a href="javascript:sentRequest('support.php')">Ticket erstellen</a>
</form>

function sentRequest(url){
    if (window.XMLHttpRequest) {
        request = new XMLHttpRequest(); // Mozilla, Safari, Opera
    } else if (window.ActiveXObject) {
        try {
            request = new ActiveXObject('Msxml2.XMLHTTP'); // IE 5
        } catch (e) {
            try {
                request = new ActiveXObject('Microsoft.XMLHTTP'); // IE 6
            } catch (e) {}
        }
    }
    if (!request) {
        alert("Kann keine XMLHTTP-Instanz erzeugen");
        return false;
    } 
  else {
        request.open('POST', url, true);
        request.send(null);
        request.onreadystatechange = interpretRequest;
    }
}

request.send(null);

<form name="ticketSystem">
<input type="text" name="subject">
<input type="text" name="message">
<a href="javascript:sentRequest('support/ticket.php');">Ticket erstellen</a>
</form>

function sentRequest(url){
  request = getAjaxReqObject();
    if (!request) {
        alert("Kann keine XMLHTTP-Instanz erzeugen");
        return false;
    } 
  else {
        request.open('GET', url, true);
        request.send("subject=subject&message=message");
    }

xmlHttp.open('GET', url?key=value&key2=value2, true);
xmlHttp.send(null);
xmlHttp.onreadystatechange = responseHandler;

<form id="create-support-ticket" method="POST" action="support/createTicket.php">

load('support.php');

$('create-support-ticket').request({
   onComplete: function(){
        load('support.php');
   }
})

$('#deindiv').load('support.php');

<!-- Formular -->
$('create-support-ticket').request();
$('#supportContent').load('support/support.php');

<form onsubmit="return false;" action="deine_seite.php" method="post" id="deine_form_id">
<!--
Deine Input-Felder usw.
-->

<input type="submit" name="save" id="save" />
</form>

<script type="text/javascript" language="javascript">

$('save').observe('click', saveData);

    function saveData(event) {
        new Ajax.Request('deine_seite.php',
        {
            method: 'get',
            parameters: $('deine_form_id').serialize(),
            onSuccess: handleResponse
        });
    }

    function handleResponse(response) {
        if (!response.responseText.isJSON()) {
            $('updateErrors').innerHTML = "";
            $('updateErrors').innerHTML = "<p class='success'>"+response.responseText+"</p>";
            $('updateErrors').style.display = "block";
            return;
        }

        var data = response.responseText.evalJSON();

        var error = "<p class='error'>";

        if (typeof(data) == 'object') {
            for (var item in data) {
                error += data[item] + "<br />";
            }
        } else {
            for (var i = 0; i < data.length; i++) {
                error += data[i] + "<br />";
            }
        }
        error += "</p>";
        $('updateErrors').innerHTML = error;
        $('updateErrors').style.display = "block";
    }
</script>

$('create-support-ticket').request();

$('create-support-ticket').request();