creating a pop up window for oauth

creating a pop up window for oauth

i'm creating a popup window for oauth. right now, i'm simply using:
window.open(href, '', 'chrome=yes')
this works pretty well. i'm looking for an improved experience, much like
what facebook offers with their login, where:
the window has a max-height and max-width. right now, it's the same size
as the parent window.
the window is centered in relation to the parent window. when i follow the
instructions on
http://www.webpop.com/blog/2011/02/16/add-a-custom-twitter-button-to-your-website,
the window is located based on the user's desktop, not the parent window.
this messes things up when the browser is not at the top left position or
on a different monitor.
the window closes when the user closes the parent window
however, looking through
https://developer.mozilla.org/en-US/docs/Web/API/window.open did not help
me with this problem. what can i do?