function getCookieVal (offset)
{
 var endstr = document.cookie.indexOf (";", offset);
 if (endstr == -1)
  endstr = document.cookie.length;

 return unescape(document.cookie.substring(offset, endstr));
}

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)
{
// set time, it's in milliseconds
var today = new Date();
var expires = 1000 * 60 * 60 * 24 * 30;
var expires_date = new Date( today.getTime() + (expires) );

document.cookie = name + "=" + value + ";expires=" + expires_date.toGMTString() + ";path=/";
}