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 GetCookieVal(offset)
{
  var endstr = document.cookie.indexOf(";", offset);

  if (("" + endstr) == "" || endstr == -1)
    endstr = document.cookie.length;

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

function SetCookie(c_name,value,expiredays)
{
    var exdate=new Date();

    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie=c_name+ "=" +escape(value) + ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}