var setCookie = function(name, value, day) {
 if(day) {
  var date = new Date();
  date.setTime(date.getTime() + day * 60 * 60 * 24 * 1000);
  document.cookie = name + '=' + value + ';expires=' + date.toUTCString() + ';path=/';
 } else {
  document.cookie = name + '=' + value + ';expires=;path=/';
 }
};
var getCookie = function(name) {
 var value = document.cookie.match('(^|;) ?' + name + '=([^;]*)(;|$)');
 return value? value[2] : null;
};
var deleteCookie = function(name) {
 var date = new Date();
 document.cookie = name + "= " + "; expires=" + date.toUTCString() + "; path=/";
}