.htaccess para usar timthumb

timthumb_htaccess

# BEGIN TimThumb .htaccess
<IfModule mod_rewrite.c> 
RewriteEngine On 
RewriteCond %{REQUEST_FILENAME} -f 
RewriteCond %{REQUEST_URI} (?i)(jpg|jpeg|png|gif)$ 
RewriteCond %{QUERY_STRING} h=([1-9]) [OR] 
RewriteCond %{QUERY_STRING} w=([1-9]) 
RewriteRule (.*) ./path/to/timthumb.php?src=%{REQUEST_URI}&%{QUERY_STRING} 
</IfModule> 
 
# END TimThumb .htaccess

Uso:

<img src="http://path/to/image.gif?h=100&w=100">

it does not work.
what am i missing?

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{REQUEST_URI} (?i)(jpg|jpeg|png|gif)$
RewriteCond %{QUERY_STRING} h=([1-9]) [OR]
RewriteCond %{QUERY_STRING} w=([1-9])
RewriteRule (.*) timthumb.php?src=%{REQUEST_URI}&%{QUERY_STRING}

htaccess and timthumb.php in same directory

and my image:
<img src="http://path/to/image.jpg?h=100&w=100">