xp registry help

Whilst I use an adsl connection for browsing and my main e-mail address I still occasionally use two dial up accounts that were used before I got broadband.
I need to transfer these two accounts onto another pc but have lost the bit of paper with the passwords on.
I know the usernames but without the passwords I can’t log on to send an email to the isp’s support desk asking for the usual email back with the details, shades of Catch 22 😮

Anyone know where these are hidden in the windows xp registry ?

thanks in anticipation,
Phil