ua = navigator.userAgent;
    nav = new Object();
    nav['isMacOS'] = (ua.indexOf('Mac OS') != -1);
    nav['isIE'] = (navigator.appName == "Microsoft Internet Explorer");

    if (nav['isIE'])
    {
        nav['isIE'] = ua.replace(/^.*?MSIE ([0-9\.]*).*$/, "$1");

        if (nav['isIE'] < 6)
            this.has_error();
    }

    if (nav['isNS'] = ua.indexOf('Netscape/') != -1)
    {
        nav['isNS'] = ua.substr(ua.indexOf('Netscape/') + 9);

        if (nav['isNS'] < 8 || !nav['isIE'])
            this.has_error();
    }

    if (nav['isOpera'] = (ua.indexOf('Opera') != -1))
    {
        nav['isOpera'] = ua.replace(/^.*?Opera.*?([0-9\.]+).*$/i, "$1");

        if (nav['isOpera'] < 9)
            this.has_error();
        nav['isIE'] = false;
    }
    nav['isGecko'] = (ua.indexOf('Gecko') != -1);

    if (nav['isFirefox'] = (ua.indexOf('Firefox') != -1))
        nav['isFirefox'] = ua.replace(/^.*?Firefox.*?([0-9\.]+).*$/i, "$1");

    if (nav['isIceweasel'] = (ua.indexOf('Iceweasel') != -1))
        nav['isFirefox'] = nav['isIceweasel'] = ua.replace(/^.*?Iceweasel.*?([0-9\.]+).*$/i, "$1");

    if (nav['GranParadiso'] = (ua.indexOf('GranParadiso') != -1))
        nav['isFirefox'] = nav['isGranParadiso'] = ua.replace(/^.*?GranParadiso.*?([0-9\.]+).*$/i, "$1");

    if (nav['isCamino'] = (ua.indexOf('Camino') != -1))
        nav['isCamino'] = ua.replace(/^.*?Camino.*?([0-9\.]+).*$/i, "$1");

    if (nav['isChrome'] = (ua.indexOf('Chrome') != -1))
        nav['isChrome'] = ua.replace(/^.*?Chrome.*?([0-9\.]+).*$/i, "$1");

    if (nav['isSafari'] = (ua.indexOf('Safari') != -1))
        nav['isSafari'] = ua.replace(/^.*?Version\/([0-9]+\.[0-9]+).*$/i, "$1");

    if (nav['isIE'] >= 6 || nav['isOpera'] >= 9 || nav['isFirefox'] || nav['isChrome']
        || nav['isCamino'] || nav['isSafari'] >= 3)
        nav['isValidBrowser'] = true;
    else
        nav['isValidBrowser'] = false;
    function passBrowserTest()
   {
        if(window.nav["isIE"])
        {
            return (parseInt(window.nav["isIE"]) >= 7)
        }
        if(window.nav.isFirefox)
        {
            return (parseInt(window.nav.isFirefox) >= 3)
        }
        return true
   }
function showLoginForm()
{
    
}