function get_cookie(name)
	{
		name = name+"=";
		var content = "";

		var allcookies = document.cookie;

		//Get cookie value
		var cpos = allcookies.indexOf(name);
		if (cpos != -1)
		{	
			//cookie exists so get content
			var start = cpos + name.length;
			var end = allcookies.indexOf(";",start);
			if (end == -1) end = allcookies.length;
		
			content = allcookies.substring(start,end);
		}

		return content;
	}

	function set_cookie(name,value)
	{
		document.cookie = name+"="+value;
		//alert(document.cookie);
	}

	function delete_cookie(name)
	{
		document.cookie = name+"=";
		//alert(document.cookie);
	}

	function add_cookie(name,value)
	{
		
		var current_value = get_cookie(name);
		
		if (current_value.indexOf(value) == -1)
		{
			//not in list so add value
			if (current_value == "")
				current_value = value;
			else
				current_value = current_value+","+value;
		}

		set_cookie(name,current_value);
	}		

	function remove_cookie(name,value)
	{
		
		var current_value = get_cookie(name);
		
		if (current_value.indexOf(value) != -1)
		{
			//remove from list
			current_value = current_value.replace(","+value,"");
			current_value = current_value.replace(value+",","");
			current_value = current_value.replace(value,"");
		}
		
		set_cookie(name,current_value);
	}		

	function toggle_cookie(name,value)
	{
		
		var current_value = get_cookie(name);
		
		if (current_value.indexOf(value) != -1)
		{
			//remove from list
			current_value = current_value.replace(","+value,"");
			current_value = current_value.replace(value+",","");
			current_value = current_value.replace(value,"");
		}
		else
		if (current_value.indexOf(value) == -1)
		{
			//not in list so add value
			if (current_value == "")
				current_value = value;
			else
				current_value = current_value+","+value;
		}

		set_cookie(name,current_value);
	}