function ScrollMenu(id) {
	el = document.getElementById(id);

	if (el != null) {

		var vscroll = (document.all ? document.documentElement.scrollTop : window.pageYOffset);
        if (vscroll > 300)
        	new Effect.Move(id, { x: 0, y: vscroll - 100, mode: 'absolute' });
		else
			new Effect.Move(id, { x: 0, y: vscroll , mode: 'absolute' });
	}
	return false;
}