Iframe redirect to parent page

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ASP.NET

IFrame

Dear all,
I am facing some issue related to Iframe.

I have two websites which are hosted on different web server. In my first website , there are four pages
Like page1,page2,page3 and page4 and pages contains 4 button button1,button2,button3 and button4 . When I click on button1 then page1 display………… similarly when I click button2 then page 2 display.

Now page1 contains one I Frame where I have set source URL to my other page of website 2 and page of website2 contains button.

Now , what I want. When I click button of page of website2 then it should redirect to page2 of website1 . We don’t loss session page website1 . Please let me know any best approach to accomplish this problem.