/*
	This code is taken from the book "JavaScript: The Definitive Guide", Fourth Edition
	It is adapted a litle
*/

// The constructor function: creates a rtl_Cookie object for the specified
// document, with a specified name and optional attributes.
// Arguments:
//   document: The Document object for which the cookie is stored. Required.
//   name:     A string that specifies a name for the cookie. Required.
//   hours:    An optional number that specifies the number of hours from now
//             after which 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 rtl_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 to
    // be stored in the cookie

    this.$document = document;
    this.$name = name;
    
//    alert(hours);
    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 rtl_Cookie object
rtl_Cookie.prototype.store = function () {
//	alert('aaaa2');
    // First, loop through the properties of the rtl_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]);
    }
//	alert('set cookieval: '+cookieval);

    // 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';
    }

//	alert('store cookie: '+cookie);

    // Now store the cookie by setting the magic Document.cookie property
    this.$document.cookie = cookie;
//    alert('this.$document.cookie: ' + this.$document.cookie);
//    alert('document.cookie: ' + document.cookie);
    
}



// This function is the load(  ) method of the rtl_Cookie object
rtl_Cookie.prototype.load = function() { 
    // 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;
    }
//	alert('load available cookies:'+ allcookies);


    // 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);
//	alert('load cookieval: '+cookieval);
	
    // Now that we've extracted the value of the named cookie, we
    // must break that value down into individual state variable 
    // names and values. The name/value pairs are separated from each
    // other by ampersands, and the individual names and values are
    // separated from each other by colons. We use the split(  ) method
    // to parse everything.

    var a = cookieval.split('&');    // Break it into an 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 rtl_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++) {
//    	alert('a[i][0]: '+a[i][0]+', unescape(a[i][1]): '+unescape(a[i][1]))
        this[a[i][0]] = unescape(a[i][1]);
//        alert(this[a[i][0]]);
//        alert('this.nw_alwaysOpenInPopup: '+this.nw_alwaysOpenInPopup);
    }

    // We're done, so return the success code
    return true;
}



// This function is the remove(  ) method of the rtl_Cookie object
rtl_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';

//	alert('set as expired cookie: '+cookie);

    this.$document.cookie = cookie;
}