// Constructor
// Create a cookie object for the specified document, with a specified
// name and optional attributes
function Cookie(document, name, hours, path, domain, secure)
{
	// Predefined properties begin with '$' to distingush them from
	// the values to be stored in the cookie
	this.$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;
}

// Store method
function _Cookie_store()
{
	// Loop through the properties of the Cookie object and put
	// together the value of the cookie. Cookies use equals sign and
	// semi-colons as separators, so we'll use colons and ampersands
	var cookieval = "";
	for(var prop in this)
	{
		// Ignore properties that begin with '$', and methods
		if((prop.charAt(0) =='$') || ((typeof this[prop]) == 'function'))
			continue;
		if (cookieval != "")
			cookieval += '&';
		cookieval += prop + ':' + escape(this[prop]);
	}
	
	// Create the whole cookie string, including the value, name and
	// other attributed
	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.$secure;

	// Store the cookie
	this.$document.cookie = cookie;
}

// Load method
function _Cookie_load()
{
	// Get a list off all cookies for this document
	var allcookies = this.$document.cookie;
	if (allcookies =="")
		return false;
		
	//Extract the named cookie
	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);
	
	// Separate out state variable names and values
	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 success code
	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;
	
	this.$document.cookie = cookie;
}

// Create a dummy cookie object so that the prototype object can be
// used to make the functions into methods
new Cookie();
Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;