//Prototype:
new Ajax.Request('test.php');
//jQuery:
$.post("test.php", { product_id: "10"} );

<script type="text/javascript" src="www/prototype.js"></script>
        <script>

            function sendRequest() {
                new Ajax.Request("test2.php", 
                    { 
                        method: 'post', 
                        postBody: 'name='+ $F('name'),
                        onComplete: showResponse 
                    });
                }
                    
            function showResponse(req){
                $('show').innerHTML= req.responseText;
            }
            
</script>

<script language="javascript">
function sendRequest(customer_id, hotmovie_id, hotmovie_title)
                {
                    var sql_delete = "DELETE FROM vod_customer_favorites WHERE customer_id = " + customer_id + " AND hotmovie_id =" + hotmovie_id ;
                    url='vod_product_info_insert_favorite.php';
                    http_request = new XMLHttpRequest();
                    http_request.open('POST', url, true);
                    http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
                    http_request.send("sql_delete=" + sql_delete);
                    
                    alert("Filme wurde aus Ihren Favoriten gelöscht!");
                };
                
</script>