function getCookie (c_name) {
  var result = -1;

  if (document.cookie.length > 0) {
    c_start = document.cookie.indexOf(c_name +"=");

    if (c_start != -1) {
      c_start = c_start + c_name.length + 1;
      c_end = document.cookie.indexOf(";", c_start);

      if (c_end == -1)
        c_end = document.cookie.length;

      result = unescape(document.cookie.substring(c_start,c_end));
    } 
  }

  return result;
}

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());
}