Basic Pop Up Web Page I Can Minimize

I want to open a web page as a pop-up and be able to minimize the pop up web page and continue to go elsewhere to difference web sites.
The pop up will have a streaming radio player embedded in it, so thats the reason I want the pop-up to be able to be minimized so to keep the audio playing.
I was able to get the lightbox pop up working with the embedded player, but I can’t minimize the lightbox popup unless I’m missing something.

Thanks for your time,
Ken