// Cookie Class courtesy of David Flanagan - 'Javascript the Definitive Guide' - O'Reilly Publishers

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.$secure = secure; else this.$secure = false;
}

function _Cookie_store()
{
  var cookieval = "";
  for(var prop in this){
    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';


  this.$document.cookie = cookie;
}

function _Cookie_load()
{
  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('&');
  for(var i = 0;i < a.length;i++){
    a[i] = a[i].split(':');
  }
  for( var i = 0;i < a.length;i++){
    this[a[i][0]] = unescape(a[i][1]);
  }
  return true;
}

function _Cookie_remove()
{
  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;
}

new Cookie();

Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load ;
Cookie.prototype.remove = _Cookie_remove;