var background;
var header;


function doInit()  {
	background = document.getElementById('backgrounds');
	header = document.getElementById('header');
}

function doScroll()  {
	var st = document.documentElement.scrollTop ? document.documentElement.scrollTop : window.pageYOffset;
	header.style.top = st + 'px';
	background.style.top = st + 'px';
}