var s = screen,
    d = document,
    w = window,
    b = navigator.userAgent.toLowerCase(),
    p = navigator.platform.toLowerCase(),
    linux = p.indexOf('linux') != -1,
    mac = p.indexOf('mac') != -1,
    safari = (b.indexOf('safari') != -1 || b.indexOf('webkit') != -1),
    firefox = b.indexOf('firefox') != -1 ,
    opera = w.opera,
    konqueror = b.indexOf('konqueror') != -1,
    firefox3 = b.indexOf('firefox/3.0') != -1,
    safari3 = safari && b.indexOf('version/3') != -1,
    ie7 = false,
    ie6 = false;