using htaccess to redirect all vistitors to a specific page

basically, im looking for an htaccess script that'll redirect all visitors to a single page - in this case a custom page that states that the site is down for repairs, etc. any help?

 

Use

RewriteEngine on
RewriteRule (.*) /page.html

Code (markup):

or (if all other pages are removed)

ErrorDocument 404 /page.html

Code (markup):