IE Detection

ie-detect.js

function isIE () {
    if (document.documentMode) {
        return document.documentMode;
    } else {
        for (var i = 7; i > 0; i--) {
            var div = document.createElement("div");

            div.innerHTML = "<!--[if IE " + i + "]><span></span><![endif]-->";

            if (div.getElementsByTagName("span").length) {
                return i;
            }
        }
    }
    return false;
}