third level domain and cakephp

I have my site with cakephp ...

I created a third level domain for img

Now i want that my third level domain points to a function of my controller...

Example: test.mydomain.com to mydomain.com/test

problem is that all points to app/webroot folder..

how to solve the problem?

My htaccess contains 

 RewriteRule    ^$ app/webroot/    [L]

 RewriteRule    (.*) app/webroot/$1 [L]  

I need to mix with another directive , but I need that Cake continues to work.

Thanks

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