[Javascript] cookies

[Tom]

Hi,

I am totally new to javascript so please excuse my ignorance. 

I would like to have a simple bit of javascript that puts a cookie onto the users computer when they first enter my site and to load up my index page with a flash intro in one of the frames...

Then when the user re-visits the site...
I'd like the javascript to check for the presence of this cookie and if it is present then to load up a welcome message in aforementioned frame.

Just so that they don't have to see the intro everytime they come to the site.

So a) is this possible and b) does anyone know of any good jscript and cookie sites that will help me to
achieve this?

Cheers 
tom
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