function hasGiftcard(url, client, prodNo){
        var giftcardUrl = url;
        var RequestUrl = giftcardUrl + '/_data/giftcardForward.php5';
         var xmlHttp = false;
        if (window.XMLHttpRequest)
        {
                xmlHttp = new XMLHttpRequest();
        }
        else if (window.ActiveXObject)
        {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        
        if (xmlHttp)
        {
                var RequestUrlComplete = RequestUrl + '?prod=' + prodNo;
                xmlHttp.open('GET', RequestUrlComplete, true);
                xmlHttp.onreadystatechange = FUNKTION;
                xmlHttp.send(null);
        }
        
        function FUNKTION()
        {
                if (xmlHttp.readyState == 4)
                {

                        if(xmlHttp.responseText == 'true'){
                                var linkUrl = '<a target="_blank" href="http://giftcard.trustpay.de/' + client + '/giftcard/' + prodNo + '">Zur Geschenkurkunde</a>';
                                document.getElementById("prod_link").innerHTML = linkUrl;
                        }
                }
        }      
}