User:Bradv/AjaxPatrolLinks.js

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function ajaxPatrolLinks() {
    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;
                    }
                }                
                aj.open("GET", url, true);
                aj.send(null);
                return false;
            }
        }
    }
}

addOnloadHook(ajaxPatrolLinks);