function mangle() {
    if (!document.getElementsByTagName && !document.createElement &&
		!document.createTextNode) return;
    var nodes = document.getElementsByTagName("span");
    for (var i = nodes.length - 1; i >= 0; i--) {
        if (nodes[i].className == "change") {
            var at = / at /;
            var dot = / dot /g;
            var node = document.createElement("a");
            var address = nodes[i].firstChild.nodeValue;

            address = address.replace(at, "@");
            address = address.replace(dot, ".");

            address = address.replace(at, "@");
            address = address.replace(dot, ".");
            node.setAttribute("href", "mailto:" + address);
            node.appendChild(document.createTextNode(address));

            var prnt = nodes[i].parentNode;
            for (var j = 0; j < prnt.childNodes.length; j++)
                if (prnt.childNodes[j] == nodes[i]) {
                if (!prnt.replaceChild) return;
                prnt.replaceChild(node, prnt.childNodes[j]);
                break;
            }
        }
    }
}