window.onscroll = function(e)
{
	if (window.pageYOffset)
	{
		offset = window.pageYOffset / 4;
	}
	else if (document.body.scrollTop)
	{
		offset = document.body.scrollTop / 4;
	}
	
	document.getElementById('BackgroundImage').style.top = '-' + offset + 'px';
	//e.stopPropagation();
}