// BEGIN HEADER ///////////////////////////////////////////////////////////////////////////////////////////
// AUTHOR: jeremy at badlib.com
// LANGUAGE: javascript1.3
// You may incorporate this code into your own code without restriction.
// This code has been provided "AS IS" and the responsibility for its operation is yours.
// You may redistribute this code, as long as this HEADER stays intact.
// Any modifications must be noted with a description and the date. Your name and contact info is optional.
// Please submit any modifications (especially fixes!) to me.
// END HEADER /////////////////////////////////////////////////////////////////////////////////////////////

function cooky(name, content, expire_date, action)
// PRE: 	'name' must be string.
// POST: 	1) Returns the contents of cookie with name 'name' if only 'name' is provided.
//			2) If name and content are provided a session cookie with those parameters will be created or changed.
//			3) If name, content and expire_date are provided the same as (2) except the cookie will expire 'expire_date' days from today.
//			4) If action is 'add' a cookie with name 'name' will have 'content' appended to it's current content
//			5) If action is 'remove' the content ofcookie 'name' that matches 'content' will be removed
// VERSION: 1.0
{
	var del = ','; //the content delimiter (default is ',')
	var regex;
	
	if(!navigator.cookieEnabled) return false;
	
	//minimal debugging help
	if(typeof name !== 'string')
	{
		Alert('"name" must be of type "string"\n\n');
		return false;
	}
	
	var current = document.cookie.split(name + '='); //array
	current = current.length < 2 ? '' : current[1]; //string - right side of array
	current = current.split(';')[0]; //string - just content
	
	if(typeof content === 'undefined')
	{
		return current;
	}
	
	//start off as a session cookie and go from there
	expires = '';
	if(expire_date)
	{
		//otherwise set offset by day
		expires = new Date();
		expires.setDate(expires.getDate() + expire_date);
		expires = 'expires=' + expires; //string - for appending to cookie name and content
	}
	
	content = content.toString(); //make sure that content is a string
	content = content.replace(/[=;]/g,''); //discard illegal characters
	var new_content = content; //create new_content string
	content = content.split(/[,]+/); //convert to an array for easy parsing later
	
	if(action === 'add' || action === '+')
	{
		new_content = current + del + new_content;
	}
	else if(action === 'remove' || action === '-')
	{
		new_content = del + new_content + del;
		while(content.length) {
			regex = new RegExp([del + content.pop() + del],['g']);
			new_content = new_content.replace(regex, del);
		}
	}
	
	//cleanup by removing redundant content and excess commas
	content = new_content.split(/[,]+/); //array
	new_content = del + new_content + del;
	while(content.length) {
		regex = new RegExp([del + content[content.length-1] + del],['g']);
		new_content = new_content.replace(regex, del);
		new_content += del + content.pop() + del;
	}
	regex = new RegExp([del+'+'], ['g']);
	new_content = new_content.replace(regex, del);
	regex = new RegExp(['^'+del], ['g']);
	new_content = new_content.replace(regex, '');
	regex = new RegExp([del+'$'], ['g']);
	new_content = new_content.replace(regex, '');
	
	//finally update the cookie and return the new content
	document.cookie = name + '=' + new_content + ';' + expires;
	return new_content;
	
	function Alert(text)
	{
		alert('cooky() reports:\n\n' + text + 'cooky() will now quit without finishing.');
	}
}
function more_cooky(name, content, expire_date)
{
	return cooky(name, content, expire_date, 'add');
}
function less_cooky(name, content, expire_date)
{
	return cooky(name, content, expire_date, 'remove');
}