function getScrollYPos() {
	var _scrollTop = document.body.scrollTop;
	if (_scrollTop == 0) {
		if (_window.pageYOffset)
			_scrollTop = window.pageYOffset;
		else
			_scrollTop = (document.body.parentElement) ? document.body.parentElement.scrollTop : 0;
	}
	return _scrollTop;
}

function setScrollYPos(y) {
	document.body.scrollTop = y;
}