function centerDahlemLogo(){
    var w = document.viewport.getWidth();
    if(w < 1024) 
        w = 1024;
    var l = (w-353) / 2;
    $("logo-bottom").setStyle({"position" : "absolute",
                               "left": l + "px",
                               "bottom": "10px"});
}
Event.observe(window, "load", centerDahlemLogo);
Event.observe(window,"resize", centerDahlemLogo);