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Thanks to, @frazelledazzell

        var isIE9 = navigator.appVersion.indexOf("MSIE 9.")!=-1;
        var isIE8 = navigator.appVersion.indexOf("MSIE 8.")!=-1;
        var isIE7 = navigator.appVersion.indexOf("MSIE 7.")!=-1;

Thanks to, jQuery4u.

CSS3 and IE7/8 versions of nth:child CSS selections,

/* standard nth */
ul.menu li:nth-child(3)
{
    /* styles for the 3rd LI */
}

/* IE nth */
ul.menu>li + li + li 

Thanks to, Michael Barrett @ Abouthalf.com