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.toUTCString())+";path=/";
}

function refrescar() {
  history.go();
}