// The constructor function:  creates a cookie object for the specified
// document, with a specified name and optional attributes.
// Arguments:
//	document:	Required.  The Document object that the cookie is stored for.
//	name:		Required.  a string that specifies a name for the cookie.
//	hours:		Optional.  the number of hours until the cookie expires.
//  path:		Optional.  a string that specifies the cookie path attribute.
//	domain:		Optional.  a string that specifies the cookie domain attribute.
//  secure:		Optional.  a Boolean value that, if true, requests a secure cookie.

function Cookie(document, name, hours, path, domain, secure)
{
	// All the predefined properties of this object begin with '$'
	// to distinguish them from other properties which are the values
	// be stored in the cookie
	this.$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; 
}

// This function is the store() method of the Cookie object.
function _Cookie_store()
{
    // First, loop through the properties of the Cookie object and
    // put together the value of the cookie. Since cookies use the
    // equals sign and semicolons as separators, we'll use colons
    // and ampersands for the individual state variables we store 
    // within a single cookie value. Note that we escape the value
    // of each state variable, in case it contains punctuation or other
    // illegal characters.
    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]);
    }
    // Now that we have the value of the cookie, put together the 
    // complete cookie string, which includes the name, and the various
    // attributes specified when the Cookie object was created.
    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.$document.cookie = cookie;
}
// This function is the load() method of the Cookie object.
function _Cookie_load()
{
    // First, get a list of all cookies that pertain to this document.
    // We do this by reading the magic Document.cookie property.
    var allcookies = this.$document.cookie;
    if (allcookies == "") return false;
    // Now extract just the named cookie from that list.
    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);
    // Now that we've extracted the value of the named cookie, we've
    // got to break that value down into individual state variable 
    // names and values. The name/value pairs are separated from each
    // other with ampersands, and the individual names and values are
    // separated from each other with colons. We use the split method
    // to parse everything.
    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(':');
    // Now that we've parsed the cookie value, set all the names and values
    // of the state variables in this Cookie object. Note that we unescape()
    // the property value, because we called escape() when we stored it.
    for(var i = 0; i < a.length; i++) {
        this[a[i][0]] = unescape(a[i][1]);
    }
    // We're done, so return the success code.
    return true;
}

// This function is the remove() method of the Cookie object.
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;
}

// Create a dummy Cookie object, so we can use the prototype object to make
// the functions above into methods.
new Cookie();
Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;

//Cookie test - check to see if cookies are allowed.
//if not redirect user to an error page
function cookieTest(doc)
{
	doc.cookie='cookieTest="cookieTest"; path=/';
	if (doc.cookie.indexOf("cookieTest",0) < 0) 
	{
		window.location = 'nocookies.html';
	}
	else
	{
		doc.cookie='cookieTest="cookieTest"; path=/; expires=Fri, 02-Jan-1970 00:00:00 GMT';
	}
}