function ajaxPatrolLinks(callback) {     var a = document.evaluate('//div[@class="patrollink"]/a', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null ).singleNodeValue;     if (a) {         var div = a.parentNode;         var url = a.href;         a.onclick = function (event) {             var aj = sajax_init_object();             if (aj) {                 while (div.firstChild) { div.removeChild(div.firstChild) };                 div.appendChild(document.createTextNode('[Marking as patrolled...]'));                 aj.onreadystatechange = function () {                     if (aj.readyState == 4 && aj.status == 200) {                         while (div.firstChild) { div.removeChild(div.firstChild) };                         div.appendChild(document.createTextNode('[Marked as patrolled]'));                         aj.onreadystatechange = null;                         if (callback) {                             callback();                         }                     }                 }                                 aj.open("GET", url, true);                 aj.send(null);                 return false;             }         }     } }  $(ajaxPatrolLinks);