Set variable from cookie value

Hi,
I have a website that saves a cookie to your browser when you log in,
The cookie value is the name of the user.
I want to see if I can read this value in captivate and set it as a variable in the content therefore no need to re-enter details in the content.
I have tried to tackle this using JS but my experience is limited.
Im using Cp8.
Thanks in advance...

Hi VC, thanks for reply,
//try to set the value and see if it works
$s('P1_ID_PER_KND_NA_CRYPT','A422313E7F62D04D12347E7DE85DC53E')doesn´t work either, firebug brings up no error but i get an checksum error for this element from the apex engine, I will test the Apex internal GetCookie Function but my own function work very well too, the error is after that...
what i see, i also get the checksum error when using the varibable id_per_knd_na, too.
so i think, javascript tries to set the value to the hidden element, but the apex engine prvented it because of SSP.
Any other ideas?
ps: i use apex 4.0.2

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