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) { 
var argv = SetCookie.arguments; 
var argc = SetCookie.arguments.length; 
var expires = (argc > 2) ? argv[2] : null; 
var path = (argc > 3) ? argv[3] : null; 
var domain = (argc > 4) ? argv[4] : null; 
var secure = (argc > 5) ? argv[5] : false; 
document.cookie = name + "=" + escape (value) + 
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
((path == null) ? "" : ("; path=" + path)) + 
((domain == null) ? "" : ("; domain=" + domain)) + 
((secure == true) ? "; secure" : "");
}

var expdate = new Date();
FixCookieDate(expdate);
expdate.setTime(expdate.getTime() + (30*24*60*60*1000));