var currentItem = 0;

var nav_items = [
	'alto',
	'estreet',
	'virg',
	'melda',
	'snowincp',
	'battery',
	'borga',
	'shop1',
	'grill',
	'manatc',
	'cpark'
	];
	
function getNumberOfItems()
	{
	return nav_items.length;
	}
	
function getItem()
	{
	return nav_items[currentItem];
	}
	
function nextItem()
	{
	currentItem++;
	if (currentItem >= nav_items.length)
		currentItem = 0;
	}
	
function prevItem()
	{
	if (currentItem <= 0)
		currentItem = nav_items.length - 1;
	else
		currentItem--;
	}