htaccess redirect to subdirectory?

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Our site has been hacked and I am wanting to get the browser back to pointing at the home.php in the correct subdirectory.

I have a splashpage up at the moment (index.htm) in the root.

I presume this is done through the htacces file but not being a programmer I am at a lost on how to write the htaccess file.

Help please - urgently!

trixiemay