Check IE version

check_ie.js

    //<editor-fold desc="Проверка версии IE">
    function getInternetExplorerVersion()
    {
        var rv = -1; // Return value assumes failure.
        if (navigator.appName == 'Microsoft Internet Explorer')
        {
            var ua = navigator.userAgent;
            var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
            if (re.exec(ua) != null)
                rv = parseFloat( RegExp.$1 );
        }
        return rv;
    }
    function checkVersion()
    {
        var ver = getInternetExplorerVersion();
        return ver;
    }
    //</editor-fold>