function floatButton() 
{
	if (document.all && submenu != null) // IE
	{
		document.all.submenu.style.pixelTop = document.body.scrollTop;
	}
	else if (document.layers) // NS 4
	{
		document.submenu.top = window.pageYOffset;
	}
	else if (document.getElementById) // NS 6 & IE 5.5
	{
		document.getElementById('submenu').style.top = window.pageYOffset;
	}
}

if (document.all)
	window.onscroll = floatButton;
else
	setInterval ('floatButton()', 100);