function toggle() {
    if (Dialog1.get_isShowing()) {
        Dialog1.Close();
    }
    else {
        Dialog1.Show();
    }
}

function Dialog_OnShow(sender, args) {
    setTabAble("ctl00_cphMain_Registrieren1_rblAnrede_0", 1, true);
    setTabAble("ctl00_cphMain_Registrieren1_rblAnrede_1", 2, true);
    setTabAble("ctl00_cphMain_Registrieren1_tbVorname", 3);
    setTabAble("ctl00_cphMain_Registrieren1_tbNachname", 4);
    setTabAble("ctl00_cphMain_Registrieren1_tbEmail", 5);
    setTabAble("ctl00_cphMain_Registrieren1_btnRegister", 6);
}

function setTabAble(id, index, setfocus) {
    var obj = document.getElementById(id);
    obj.tabIndex = index;
    obj.tabEnabled = true;
    if (setfocus) {
        obj.focus();
    }
}