function check_redirect(action)
{
    try
    {
        var url_iframe = document.getElementById('test_redirect').contentWindow.location.href;     
        // non redirigé --> loggé SSO
        if(action!="")
        	location.href = "https://openid.labsfr.fr/sso/proxy/autologin.php?action="+action;
        else
        	location.href = "https://openid.labsfr.fr/sso/proxy/autologin.php";      
    }
    catch(err)
    {
        // redirigé --> non loggé SSO
    }
}