function toggle_diary(id, ref){
	if (ref.checked) {
		add_to_diary(id);
	} else {
		remove_from_diary(id);
	}
}

function add_to_diary(id){
	var d = read_diary();
	var exists = false;
	if (d) { 
		var darray = d.split("|");
		for (var key in darray){
			if (darray[key] == id) exists = true;
		}
		if (!exists) {
			d = d + '|' + id;
			erase_diary();
			create_diary(d);
		}
	} else {
		create_diary(id);
	}
}

function remove_from_diary(id){
	var d = read_diary();
	var darray = d.split("|");
	for (var key in darray) {
		if (darray[key] == id) var keyindex = key;
	}
	darray.splice(keyindex,1);
	d = darray.join("|");
	erase_diary();
	create_diary(d);
}

function create_diary(value) {
	var date = new Date();
	date.setTime(date.getTime()+(30*24*60*60*1000));
	var expires = "; expires="+date.toGMTString();

	document.cookie = 'diary' +"="+value+expires+"; path=/";
}

function read_diary() {
	var nameEQ = 'diary' + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function erase_diary() {
	create_diary('diary',"",-1);
}