function position_eye(e) {
    var el = document.getElementById("eye");
    var ev = e || window.event;
    var posx = (ev.clientX)-88-48;
    var posy = (ev.clientY)-88-56;

    if(posx>0)
        el.style.left = 68+5*(posx/screen.availWidth)+'px';
    else
        el.style.left = 68+20*(posx/(88+48))+'px';
    if(posy>0)
        el.style.top = 68+5*(posy/screen.availHeight)+'px';
    else
        el.style.top = 68+20*(posy/(88+56))+'px';
}