Ok, it must have been a quirk in my system. I had a windowblinds theme on and it may have cause that issue. That's why I said it might have been a quirk in my system cause I didn't remember it doing that in the past.
Ok, thanks to the help of posts on other sites I finally found what I was looking for:
All of this is IE ONLY.
It kind of does what you want, but with some problems/differences. The page that makes the pop-up cannot be closed. In addition the pop-up always remains in focus over the page that created it, however when you minimize the main page it will minimize the pop-up.
Test it for yourself:
There are two ways to do it:
//this method will not allow you to do anything to the opener window (the window that opened the pop-up) till you close the pop-up
window.showModalDialog('card.htm','','');
//this one will allow you to do stuff to both the pop-up and the original window.
window.showModelessDialog('card.htm','','');
The first URL I gave you was for showModalDialog. Here's the URL to showModelessDialog:
As a side note, you could also go for the fullscreen method in IE if that fits what you would need. Again all of this only works in IE.