Best way to open a new window

[bnations]

I've been out of the Web Design field for a while and I am just wondering what the most popular (cross browser) method for opening new browser windows is now a days. Specifically I have seen some clean looking popups without borders that I would like to emulate. I realize that some people use hidden layers which wont work for me because I need to load a new page entirely.
So what would you guys recommend using to get that cool look?

Thanks

[frozen interact]

Why do you need to load the whole page entirely?
There are some great ajax tools out to help your site have a good user interface.
Have a look at scriptaculous.

Chris.