function writeCookie(name, value, expires)
{
 var expire = "";
 if(expires != null)
 {
  expire = new Date((new Date()).getTime() + expires * 3600000);
  expire = "; expires=" + expire.toGMTString();
 }
 document.cookie = name + "=" + escape(value) + expire;
}

function readCookie(name)
{
 var cookieValue = "";
 var search = name + "=";
 if(document.cookie.length > 0)
 {
  offset = document.cookie.indexOf(search);
  if (offset != -1)
  {
   offset += search.length;
   end = document.cookie.indexOf(";", offset);
   if (end == -1) end = document.cookie.length;
   cookieValue = unescape(document.cookie.substring(offset, end))
  }
 }
 return cookieValue;
}