To access your tracking code from within your Google Analytics account:
Log in to Google Analytics at
http://www.google.com/analytics
From the Overview page, select the account that has the profile for the tracking code you're looking for, as the code is profile-specific.
Select the profile from the accounts Overview page.
From that profile's Actions column, click Edit
At the top right of the 'Main Website Profile Information' box, click Check Status
Your tracking code can be copied and pasted from the text box in the Instructions for adding tracking section