var currentDiv = null;
var newDiv = null;
var speed = 20;

function initializePromoNav()
{
	currentDiv = document.getElementById("promoDiv1");
	setTimeout(rollPromos, 15000);
}
function initiateSlideIn(newDivName)
{
	newDiv = document.getElementById(newDivName);
	//slideIn();
	switchDiv();
}

function switchDiv() {
	currentDiv.style.visibility = "hidden";
	newDiv.style.visibility = "visible";
	currentDiv = newDiv;
}

function slideIn()
{
	var stopPosition = 1;

	if (parseInt(newDiv.style.left) < stopPosition )
	{
		newDiv.style.left = parseInt(newDiv.style.left) + speed + "px";
		currentDiv.style.left = parseInt(currentDiv.style.left) + speed + "px";
		setTimeout(slideIn, 1);
	}
	else {
		if (parseInt(currentDiv.style.left) > 800) {
			currentDiv.style.left = "-820px";
		}
		currentDiv = newDiv;
	}

}

function rollPromos() {
	
	var currentDivCount = currentDiv.id.substring(currentDiv.id.length-1);
	var newDivCount = parseInt(currentDivCount) + 1;
	//alert(newDivCount);
	if (newDivCount > 3) {
		newDivCount = 1;
	}
	
	var newDivName = "promoDiv" + newDivCount;
	
	initiateSlideIn(newDivName);
	
	setTimeout(rollPromos, 15000);
}