$.browser.msie6 =
    $.browser.msie
    && /MSIE 6\.0/i.test(window.navigator.userAgent)
    && !/MSIE 7\.0/i.test(window.navigator.userAgent)
    && !/MSIE 8\.0/i.test(window.navigator.userAgent);

$.browser.msie7 =
    $.browser.msie
    && /MSIE 7\.0/i.test(window.navigator.userAgent)
    && !/MSIE 8\.0/i.test(window.navigator.userAgent);