Iframe with ASP.NET website back button issue in IE 7/8

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IE7

IE

IE8

IFrame

Hello,

I have searched online quite a bit about this but still cannot find a solution.
I have an ASP.NET web application in an Iframe on a parent website. In IE7/8 only when selecting the back button at any point, it redirects to outside of the parent site, to the link that the iframe is directing at.

In IE6, IE 9, Firefoxes.. it works as expected, moving between each page in the Iframe content.

Is there a way I can at least stop it from jumping out of the IFrame, and stay within the parent website on back button?

Thanks