// The constructor function: creates a cookie object for the specified
// document, with a specified name and optional attributes.
// Arguments:
//   document: The Document object that the cookie is stored for. Required.
//   name:     A string that specifies a name for the cookie. Required.
//   hours:    An optional number that specifies the number of hours from now
//             that the cookie should expire.
//   path:     An optional string that specifies the cookie path attribute.
//   domain:   An optional string that specifies the cookie domain attribute.
//   secure:   An optional Boolean value that, if true, requests a secure cookie.
//
function Cookie(document, name, hours, path, domain, secure)
{
  this.$document = document;
  this.$name = name;
  if (hours)
    this.$expiration = new Date((new Date()).getTime() + hours*3600000);
  else this.$expiration = null;
  if (path) this.$path = path; else this.$path = null;
  if (domain) this.$domain = domain; else this.$domain = null;
  if (secure) this.$secure = true; else this.$secure = false;
}
Cookie.prototype.store = function () {
  var cookieval = "";
  for(var prop in this) {
    // Ignore properties with names that begin with '$' and also methods.
    if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function')) 
      continue;
    if (cookieval != "") cookieval += '&';
    cookieval += prop + ':' + escape(this[prop]);
  }

  var cookie = this.$name + '=' + cookieval;
  if (this.$expiration)
    cookie += '; expires=' + this.$expiration.toGMTString();
  if (this.$path) cookie += '; path=' + this.$path;
  if (this.$domain) cookie += '; domain=' + this.$domain;
  if (this.$secure) cookie += '; secure';
  
  // Now store the cookie by setting the magic Document.cookie property.
  this.$document.cookie = cookie;
}
Cookie.prototype.load = function() { 
  var allcookies = this.$document.cookie;
  if (allcookies == "") return false;
  var start = allcookies.indexOf(this.$name + '=');
  if (start == -1) return false;   // Cookie not defined for this page.
  start += this.$name.length + 1;  // Skip name and equals sign.
  var end = allcookies.indexOf(';', start);
  if (end == -1) end = allcookies.length;
  var cookieval = allcookies.substring(start, end);
  var a = cookieval.split('&');    // Break it into array of name/value pairs.
  for(var i=0; i < a.length; i++)  // Break each pair into an array.
    a[i] = a[i].split(':');
  for(var i = 0; i < a.length; i++) {
    this[a[i][0]] = unescape(a[i][1]);
  }
  return true;
}
Cookie.prototype.remove = function() {
  var cookie;
  cookie = this.$name + '=';
  if (this.$path) cookie += '; path=' + this.$path;
  if (this.$domain) cookie += '; domain=' + this.$domain;
  cookie += '; expires=Fri, 02-Jan-1970 00:00:00 GMT';
  this.$document.cookie = cookie;
}