&redirectURL

Hello everyone,
This is my first time posting.
I have a form that I am using, where results are sent via email. I would like the confirmation page to come up as a smaller, popup style window as opposed to a full window. My organization is a non-profit, working with injured soldiers, so the less confusion for them, the better.
This is what I have:

Code:

---

$MailToAddress = "msumrack@woundedwarriorproject.org, srempel@woundedwarriorproject.org";
$redirectURL = "thanks.html";
$MailSubject = "[Resume Worksheet Response]";
$sendHTML = TRUE;
$serverCheck = TRUE;

---

Could anyone tell me what I need to change to have the "thanks.html" page come up in a compact window?
Thank you so much!