How can I allow two javascript:OpenPopUpPage dialogs to be opened at the same time

I have added a script editor that contains two links to show pop-ups dialogs as follow:-

<li unselectable="on"><a href="javascript:OpenPopUpPage('/view/viewer_index.shtml?id=726',1000,1000);" unselectable="on">Camera1</a></li><li unselectable="on"><a href="javascript:OpenPopUpPage('/view/viewer_index.shtml?id=728',1000,1000);" unselectable="on">Camera2</a></li>

But currently If the user click on camera1 link , he cannot navigate to the camera2 link, as it seems thejavascript:OpenPopUpPage will block the SP site from navigation.

So my question is  how I can allow the user to open more than one JavaScript pop-ups at the same time ?

Thanks