function getCookie(name) {
  var dc=document.cookie;
  var prefix=name+"=";
  var begin=dc.indexOf("; "+prefix);
  if (begin==-1) {
    begin=dc.indexOf(prefix);
    if(begin!=0)return null;
  } else
    begin+=2;
  var end=document.cookie.indexOf(";",begin);
  if (end==-1)
    end=dc.length;

  return unescape(dc.substring(begin+prefix.length,end));
}

function setCookie(name, value, expires, path, domain, secure) {
  document.cookie=name+"="+escape(value)+
    ((expires)?"; expires="+expires.toGMTString():"")+
    ((path)?"; path="+path:"")+
    ((domain)?"; domain="+domain:"")+
    ((secure)?"; secure":"");
}

function deleteCookie(name, path, domain) {
  if (getCookie(name)) {
    document.cookie=name+"="+
    ((path)?"; path="+path:"")+
    ((domain)?"; domain="+domain:"")+
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}