Local Shared Objects with Javascript

Hi,

I'm creating a web 2.0 widget thing, that will be on multiple sites. The problem is that users will have to log-in to use the widget, but as the widget is on multiple sites I can't use cookies. So, I was wondering if:

1. How can I interact using javascript with the Local Shared Objects?

The idea: I make a 1 px flash file that is included with the widget. The user signs in, using javascript I add a user-id to the flash file. User goes to new site with widget, the file is loaded, it sees there is already a user-id takes it and logs the user in.

Basically, I'm using it like a third party cookie, except that third party cookies are turned off by defualt and this isn't.

I realize I won't get the awsner from here, so do you guys know any other Flash forums where I could ask this?