htaccess - how do i block visitors?

[Van Hellseek]

this is my htaccess file at present...

<IfModule mod_php4.c>
php_value upload_max_filesize 100M
php_value max_execution_time 800
php_value post_max_size 100M
</IfModule>

exactly what do i need to add to that in order to prevent visitors from viewing my site while i am working on it? ideally i'd like to redirect all visitors to a temporary landing page, but as long as they can't acess my site is all that really matters.

 

[Van Hellseek]

ok, so if that will deny everyone except me, how can i tell if it's working or not?