$VAR_url and MAMP

Hi everyone ! I've got a problem with rewrite rules and MAMP. I'm working on a dynamic website which is already in production (online). There's some little bugs I need to fix. Because of this, I made a local installation with MAMP to run some tests. My problem is that all the URL have been cleaned with the rewrite mod within the file .htaccess

RewriteCond %{SCRIPT_FILENAME} !.+\..+
RewriteRule ^(.+)$ /category.php?VAR_url=$1 [L,NC] 

It works normally online but not in MAMP.

In order to be like this: [http://www.mysite.com/category.php?VAR_url=$1] <br>

It gives this: [http://www.mysite.com/category1]

The problem is that in my local installation, I can access the home page which is like this:

[localhost/my-project/index.php]

But if I click on a dynamic link (like "category1"), it returns an error 404. I tried to access my page with the (not cleaned) Url by typing directly:

[http://www.mysite.com/category.php?VAR_url=category1 ] and it works.

So two Options:

1°) Delete the code which is modifying the URL I tried to delete my Rewrite rule but nothing happend.. Therefore the link in the html and in the data base is like this:

<a href="category1">category1</a>

(it doesn't refer to a page.html but to precise data in a table wich is correct)

2°) Understand what's goin'on, but it is much more difficult than option 1.

Any Ideas ? :)