2 domains with 1 c5 installation and 1 db

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If I have 2 domains, firstdomain.com, and seconddomain.net, and they are both hosted in corresponding folders, /public_html/firstdomain/, and /public_html/seconddomain/, how can I set up mod_rewrite rules so that both of these domains can be fully served by my concrete installation (located at /public_html/concrete) ? I have enabled pretty urls, so at the moment, the 2 locations of these sites is:http://www.mysite.com/firstdomain/*... andhttp://www.mysite.com/seconddomain/*... - I don't want to use redirects to send to another url - is this possible? Thanks in adance!

fandang