function getIEVersion(ua)
{
    var IEOffset = ua.indexOf('MSIE ');
    return parseFloat( ua.substring(IEOffset + 5, ua.indexOf(';', IEOffset)) );
}
function qualifyBrowser(qualifiedVersion)
{
    var ua = navigator.userAgent;
    var ret = false;
    if (navigator.appName == 'Microsoft Internet Explorer')
    {
        if (parseInt(getIEVersion(ua)) >= qualifiedVersion )
        {
            if (ua.indexOf('Windows') != -1)
            {
                ret = true;
            }
        }
    }
    return ret;
}