You need two forms. You can not have form in form. You need to copy data between forms with javascript. You can do that with this:
function copydata() {
document.form1.username.value = document.form2.username.value;
document.form1.passwd.value = document.form2.password.value;
return 1;
}
If I am getting this right you have login with two different actions. All you have to do is to apply this code once when secondary (submit for second form) submit button is clicked.