So there is a media website you wish to offer on your own website through a popup? If I understand correctly you would need to use an iframe.
Consider copyright laws. I'm not sure how it works through iframes but iframes allow a sort of window through to another site and it means hiding that sites logo, trademarks, copyright information, policy links etc. All the stuff that may be intended and required to be on show when someone is presented with certain media.
Another alternative if the media site is your own is loading the html into the window, removing the header is possible. Scraping your own HTML website (specifically getting media attributes) then using them in code within your popup. That might be a bit complex but taking information from a plain HTML website in a dynamic manner often has to be. It is often a quicker task to convert a HTML site to a CMS then you'll have a database of data to play with.