// Cookie Constructor
function Cookie( document, name, days, path, domain, secure )
{
  this.$document = document;
  this.$name = name;
  if( days )
    this.$expiration = new Date( ( new Date() ).getTime() + days * 24 * 60 * 60 * 1000 );
  else
    this.$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;
}

// Store Method
function _Cookie_store()
{
  // build value of cookie using name:value&name:value...
  var cookieval = "";
  for( var prop in this )
  {
    // ignore $vars and functions
    if( ( prop.charAt(0) == '$' ) || ( ( typeof this[prop] ) == 'function' ) )
      continue;
    if( cookieval != "" ) cookieval += '&';
    cookieval += prop + ':' + escape( this[prop] );
  }

  // complete cookie string
  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';

  // store cookie
  this.$document.cookie = cookie;
}

// Load Method
function _Cookie_load()
{
  // get all the cookies from this document
  var allcookies = this.$document.cookie;
  if( allcookies == "" ) return false;

  // now extract just the value of the named cookie from the list
  var start = allcookies.indexOf( this.$name + '=' );
  if( start == -1 ) return false;
  start += this.$name.length + 1;
  var end = allcookies.indexOf( ';', start );
  if( end == -1 ) end = allcookies.length;
  var cookieval = allcookies.substring( start, end );

  // now break up value
  var a = cookieval.split( '&' );
  for( var i = 0; i < a.length; i++ )
    a[i] = a[i].split( ':' );

  // assign the values to the names
  for( var i = 0; i < a.length; i++ )
    this[a[i][0]] = unescape(a[i][1]);

  return true;
}

// Remove Method
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;
}

// convert functions into methods
new Cookie();
Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;