function createCookie(name, value, seconds)
{
  if (seconds) {
    var date = new Date();
    date.setTime(date.getTime()+(seconds));
    var expires = "; expires="+date.toGMTString();
  }
  else var expires = "";
  
  document.cookie = name+"="+value+"; path=/";
}

function readCookie(name)
{
  var ca = document.cookie.split(';');
  var nameEQ = name + "=";
  for(var i=0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1, c.length); //delete spaces
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
  return null;
}

function eraseCookie(name)
{
  createCookie(name, "", -1);
}