// Swaps between Items
// Item IDs starting with 1

var delay_offer = 5; 				// Delay in seconds
var name_offer = "box_offer";		// IDs of items 2 swap


var changetime_offer = window.setInterval('changeItems_offer("next")', delay_offer * 1000);

// Change Items
function changeItems_offer(direction)
{
	// Get first item
	itemstart = parseInt(document.getElementById(name_offer + "_itemstart").value);

	// Get number of items
	itemstotal = parseInt(document.getElementById(name_offer + "_itemstotal").value);

	// Hide all items
	i = 1;
	while(document.getElementById(name_offer + "_" + i))
	{
		document.getElementById(name_offer + "_" + i).style.display = "none";
		i++;
	}

	// Next item
	if(direction == "next")
	{
		if(document.getElementById(name_offer + "_" + (itemstart + 1)))
		{
			document.getElementById(name_offer + "_" + (itemstart + 1)).style.display = "block";
			document.getElementById(name_offer + "_itemstart").value = itemstart + 1; 
		}
		if(itemstotal == itemstart)
		{
			document.getElementById(name_offer + "_1").style.display = "block";
			document.getElementById(name_offer + "_itemstart").value = 1; 
		}
	}

	// Previous item
	if(direction == "back")
	{
		if(document.getElementById(name_offer + "_" + (itemstart - 1)))
		{
			document.getElementById(name_offer + "_" + (itemstart - 1)).style.display = "block";
			document.getElementById(name_offer + "_itemstart").value = itemstart - 1; 
		}
		if(itemstart - 1 < 1)
		{
			document.getElementById(name_offer + "_" + itemstotal).style.display = "block";
			document.getElementById(name_offer + "_itemstart").value = itemstotal; 
		}
	}
}

function stopItems_offer()
{
	window.clearInterval(changetime_offer);
}

function startItems_offer()
{
	changetime_offer = window.setInterval('changeItems_offer("next")', delay_offer * 1000);
}