var scrollSpeed = 1;// Speed in milliseconds
var step = 0.1;// How many pixels to move per step
var current = 0;// The current pixel row
var imageWidth = 2247;// Background image width
var headerWidth = 1280;// How wide the header is.
var restartPosition = -(imageWidth - headerWidth);// The pixel row where to start a new loop
// Calls the scrolling function repeatedly

function scrollBg()
{
	// Go to next pixel row.
	current -= step;
	
	// If at the end of the image, then go to the top.
	current = current <= restartPosition ? 0 : current;
	
	// Set the CSS of the header.
	$('#header').css("background-position", current+"px 0");
}