After Iframe Login open a new window

Hi all,
I have a client who want to have a login to their application portal live in an iframe on wordpress. I promise, I have tried to convince against.

I have full control of the wordpress install, but I do not have access to the code on the portal. The submit input has an onclick="return redirect()

What is the best approach for after successful login, opening a new window with the portal? I do not want to just have a click event in case they fill out the wrong credentials.

Thoughts? Obviously, if this is a redundant question, please lead me to the original.

Thanks in advance

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