function facebook(id)
{
    var width = 600;
    var height = 400;
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    var url = 'http://www.facebook.com/sharer.php?u=http://www.videomix.cz/video/' + id + '/';
    var features = "width=" + width + ",height=" + height + ",status,resizable,left=" + left + ",top=" + top + "screenX=" + left + ",screenY=" + top;
    myWindow = window.open(url, "Facebook", features);
}