When is window.open a pop up?

[pairustwo]

I mean - if a function including the window.open command is called by an onclick is it the same as if it were called by onload.
-or-
If a user clicks on a link, firing the window.open command, is the resulting window considered a pop up? More importantly will it be blocked by pop up killers and firewalls?

I'm having lots of trouble with a browser redirect that does a window.open for newer browsers. This new window is being blocked by popup killers.

I'm wondering if I let the user initiate the window.open will the results will be different.

[chrismiceli]

the pop up killer that mozilla uses kills onLoad popups, if you click, they assume you might be needing the information, but if you click a link that goes to a page w/ a onload popup, it kills it.

[pairustwo]

I'm sort of dense when it comes to the DOM. Can you tell me how the browser knows how or where the window object originates?

Pairustwo