Cookie กับ Javascript

//expires=วัน
function Set_Cookie(name, value, expires, path, domain, secure){
  var today=new Date();
  today.setTime(today.getTime());
  if(expires){
    expires = expires*1000*60*60*24;
  };
  var expires_date = new Date(today.getTime() + (expires));
  document.cookie = name + "=" +escape(value) +
    ((expires) ? ";expires=" + expires_date.toGMTString() : "") +
    ((path) ? ";path=" + path : "") +
    ((domain) ? ";domain=" + domain : "") +
    ((secure) ? ";secure" : "");
};

function Get_Cookie(name) {
  var start=document.cookie.indexOf(name+"=");
  var len=start+name.length+1;
  if((!start) && (name!=document.cookie.substring(0, name.length))) {
    return null;
  };
  if (start==-1 ) return null;
  var end=document.cookie.indexOf(";", len);
  if (end==-1) end = document.cookie.length;
  return unescape(document.cookie.substring( len, end ));
};

function Delete_Cookie(name, path, domain) {
  if (Get_Cookie(name)) document.cookie=name + "=" +
    ((path) ? ";path=" + path : "") +
    ((domain) ? ";domain=" + domain : "" ) +
    ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
};