Prevent Iframe URL and content in browser history

[Ahtesham Quraish]

I am facing one issue like I have two model windows. One use the iframe to show the external content on my app. When I open the iframe containing window and then close it after viewing the external app content I jump to second model window. While staying  on second window I click the browser back button,  browser popups the last injected url and content into history which is basically the first iframe  URL and content,  browser tries

to find iframe and load the content into it. I want browser not to push Iframe entry into history.  How to do it in javascript?