Moving domain names

I'm going to switch domain names i believe this weekend (maybe) and need to figure out a way to make sure the a user uploaded image folder is rewritten to the new URL

ex: http://olddomain.com/forums/uploader

TO

http://newdomain.com/forums/uploader


Should i simply do this by leaving the old account active and placing a .htaccess file in the root and all other folders pointing to the new domain. But then what should the .htaccess look like.

Thanks

Yes, you should leave old domain working and use redirect rules as described here:

301 Redirecting Domains