[TYPO3-linux] .htaccess symlinks

[Rapunzl]

My host, LunarPages, does support symlinks via .htaccess.

For Example:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule sig.png test.php [L]
RewriteRule index.html www.mydomain.com/cms [L]
RewriteRule index.htm www.mydomain.com/cms [L]
RewriteRule index.php www.mydomain.com/cms [L]

This probably seems like a no-brainer, but I can't figure out how to set up 
Typo 3 when I have:
http://mydomain.com/cms
http://mydomain.com/src

I either get a 500 Error or a directory listing any way I configured it. I 
guess I'm not understanding whether the src/typo3 or cms/typo3 directory 
should be the rewrite and what the RewriteBase directory should be. I'm an 
obvious newbie but usually a quick study.

One more little twist... I don't usually post the www. prefix for my site 
but want either www.mydomain.com or mydomain.com to be directed to my root 
site which will be symlinked to my Typo3 install.