I have an issue with iFrame and I hope I am not the only one.

I want to embed my recruitment page in my website using an iFrame. Here is the code :

<iframe src="https://recruit.zoho.com/recruit/Portal.na?iframe=false&digest=2FjzpsOWZ2sHupW1NjL1SnGAUnkE7bVo.a85bxdBEmQ-" width="100%" height="1500" frameborder="0">

</iframe>

Everything is ok and my recruitment page is in my website:  http://www.aegide-international.com/recruitment.html

The issue is : 

- You consult a job : OK, correct display inside the iFrame

- You want to login or register, OK the login window is opening inside the iFrame

- BUT: once logged or registered, you quit the website and the zoho recruitment page opens in the same page, outside my Website (losing all the navigation menu and interface)

QUESTION: How can I force the recruitment page to stay in the iFrame of my website when I log or register?

Thank you for your help.

Vincent