function eyefollow() {
var tooltipSpan = document.getElementById('eyes');
window.onmousemove = function (e) {
var x = screen_drag_offset*(e.clientX),
y = screen_drag_offset*(e.clientY);
tooltipSpan.style.top = (y + 484) + 'px';
tooltipSpan.style.left = (x + 448) + 'px';
}
}
where var "screen_drag_offset" decides the drag factor for the eyeballs to prevent overcrossing layers.