Please help me to make static pages from dynamic pages

Hello,
I have these:
www.domain.com/index.php?page=register
www.domain.com/index.php?page=login

How do I make them to be:
www.domain.com/register.html
www.domain.com/login.html

Can you please help me how to do it?

Here is my .htaccess file:

Options +FollowSymLinks
RewriteEngine On
RewriteRule ^([0-9]+)\.html$ /index.php?page=register [QSA,L]
RewriteRule ^([0-9]+)\.html$ /index.php?page=login [QSA,L]

On the real live page, when I put www.domain.com/register.html , then some error occurred.

Can you please help?

Thanks.

 

I think this will work:

Options +FollowSymLinks
RewriteEngine On
RewriteRule ^([a-z]+)\.html$ /index.php?page=$1 [L,NC]

Code (markup):

 

Yes. It worked.
Thanks.