First URL Rewrite. Not working !

Hai folks,

I want to rewrite below url

http://mysite.com/peoplesearch.php?FirstName=First+Name&LastName=tom&Submit=Find

Code (markup):

to

http://mysite.com/tom.html

Code (markup):

* the last name parameter is always changing. for example i have put 'tom' in that.

Now i have done the rewriting and upload the .htaccess to my root folder. but it's not working

my .htaccess as follows.

Options +Indexes
Options +FollowSymlinks
RewriteEngine on
RewriteBase /
RewriteRule ^(.*)\.html$ peoplesearch.php?FirstName=First+Name&LastName=$1&Submit=Find [L]

AddType x-mapp-php5 .php

Code (markup):

Please Help !