Javascript操作Cookie

<script>
function getCookieVal(offset) {
  var endstr = document.cookie.indexOf(";",offset);
  if(endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset,endstr));
}
function FixCookieDate(data) {
  var base = new Date(0);
  var skew = base.getTime();
  if(skew > 0)
    date.setTime(date.getTime() - skew);
}
function GetCookie(name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while(i < clen) {
    var j = i + alen;
    if(document.cookie.substring(i,j) == arg)
      return getCookieVal(j);
    i = document.cookie.indexOf(" ",i) + 1;
    if(i == 0) break;
  }
  return null;
}
function SetCookie(name,value,expires,path,domain,secure) {
  document.cookie = name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}
function DeleteCookie(name,path,domain) {
  if(GetCookie(name)) {
    document.cookie = name + "==" +
      ((path) ? "; path=" + path : "") +
      "; expires=The,01-Jan-70 00:00:01 GMT";
  }
}
var expdate = new Date();
FixCookieDate(expdate);
expdate.setTime(expdate.getTime() + (365*24*60*60*1000));
</script>
<script>
//读取COOKIE
// alert( readCookie("myCookie") );
function readCookie(name)
{
  var cookieValue = "";
  var search = name + "=";
  if(document.cookie.length > 0)
  {
    offset = document.cookie.indexOf(search);
    if (offset != -1)
  &