search results template

Hi,

I am using a custom layout for search results page via Theme Setup->Page Setup->Search Page->Custom Display. I want to apply a different CSS class depending on the value stored in a particular custom field. It looks like I can’t use PHP within the custom display entry area (which would let me do a conditional check on the value and echo appropriate class name), so I’m wondering what other option there might be. I’ve set up a child theme, is there a way to override the built in search results template file?

thanks,
A