Parked Domains with .htaccess redirection issues

Hi All,

I have a WPMU installation working with two unique websites with domains maindomain.com and otherdomain.com

I have parked domains at maindomain.ie and otherdomain.ie which I want to permanently redirect to the appropriate .com domains above. I want this redirection to also redirect maindomain.ie/about to maindomain.com/about not just to drop the /about and redirect to maindomain.com.

This works for otherdomain.ie/about redirecting to otherdomain.com/about but not for main domain. Please see my .htaccess file below:

Options +FollowSymLinks
RewriteEngine On

RewriteCond %{HTTP_HOST} ^maindomain.ie$ [OR]
RewriteCond %{HTTP_HOST} ^www.maindomain.ie$
RewriteRule (.*) http://www.maindomain.com/$1 [R=301,L]

RewriteCond %{HTTP_HOST} ^otherdomain.ie$ [OR]
RewriteCond %{HTTP_HOST} ^www.otherdomain.ie$
RewriteRule (.*) http://www.otherdomain.com/$1 [R=301,L]

# BEGIN AnyFont
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^images/(.*)\.png$ /wp-content/plugins/anyfont/img.php [L]
</IfModule>
# END AnyFont

# BEGIN WordPress
RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
# END WordPress

A second lesser question: why does the above .htaccess (or WPMU in general?) drop the www. after redirection. i.e. – even if I go to http://www.maindomain.com it goes to maindomain.com (this happens for both maindomain and otherdomain)

Any help is greatly appreciated. Thank you very much in advance.

Best Regards,
~mccrodp