<form id="commentform">

.....

</form>

<script src="restorecommenterinfo.js"></script>

function toDict(str, assignment, delim, trimBoth){
var i, pair, params, len, trimFunc, retnObj = {};
assignment = assignment || "=";
delim = delim || '&';
trimBoth = (trimBoth === true);
params = str.split(delim);
if (trimBoth) {
trimFunc = trim;
}
else {
trimFunc = function(){};
}
for (i = 0, len = params.length; i < len; i++) {
pair = params[i].split(assignment);
retnObj[trimFunc(pair[0])] = (pair[1] === undefined ? null : trimFunc(pair[1]));
}
return retnObj;
}

function trim(str){
return str.replace(/^\s*(.*?)\s*$/, '$1');
}

function getCookie(key, defValue){
var cookies = {}, value;
if (!key) {
return null;
}

cookies = toDict(document.cookie, "=", ";", true);
key = key.toLowerCase();
for (var p in cookies) {
if (cookies.hasOwnProperty(p) && p.toLowerCase() === key) {
return unescape(cookies[p]);
}
}

return defValue !== undefined ? defValue : null;
}

function setCookie(key, value, expires, path, domain, secure){
if (!key) {
return;
}

key = key.toLowerCase();

key = key + '=' + escape(value) + ";";
expires = expires ? ("expires=" + new Date(new Date().getTime() + expires * 1000).toGMTString()) + ";" : "";
path = !!path ? "path=" + path + ";" : "path=/;";
domain = domain ? ("domain=" + domain) + ";" : "";
secure = secure ? "secure=true;" : "";
document.cookie = [key, expires, path, domain, secure].join("");
}

function delCookie(key, path, domain){
key = key.toLowerCase();
setCookie(key, "", -1000, path, domain);
}

function onLoad(){
try {
var frm = document.getElementById("commentform");
if (frm) {
frm.onsubmit = function(){
var inputs = frm.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
var input = inputs[i];
if (input.type === "text") {
setCookie("comment-" + input.name, input.value, 3600 * 24 * 30);
}
}
}
var textboxes = frm.getElementsByTagName("input");
for (var i = 0; i < textboxes.length; i++) {
var tb = textboxes[i];
if (tb.type === "text") {
var history = getCookie("comment-" + tb.name);
if (history) {
tb.value = history;
}
}
}
}
}
catch (e) {
alert(e);
}
}

window.onload = onLoad;