function getScrollY() 
{
	var positionY = 0;

	if( typeof( window.pageYOffset ) == 'number' ) 
	{
		//Netscape compliant
		positionY = window.pageYOffset;
	} 
	else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) )
	{
		//DOM compliant
		positionY = document.body.scrollTop;
	} 
	else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) )
	{
		//IE6 standards compliant mode
		positionY = document.documentElement.scrollTop;
	}

	return positionY;
}

var lastY, currentY;

function recordbeginvalues()
{
	if (document.getElementById&&!document.all)
	{
		lastY = window.pageYOffset;
	}
	else
	{
		lastY = document.documentElement.scrollTop;
	}

	startPolling();
}

function startPolling(){setInterval("poll()",10)}

function poll()
{
	currentY = getScrollY();

	if (lastY!=currentY)
	{
		lastY=currentY;
	}

	var leftCards = document.getElementById("left-cards");
	var rightCards = document.getElementById("right-cards");
	var position = "" + (280 + lastY) + "px";

	leftCards.style.top = position;
	rightCards.style.top = position;
}