AJAXed theme collapsible panels and SEO

For clarity sake, I’ve been considering WordPress themes that use AJAXed collapsible panels which would contain my blog posts. (Only the post titles would display on the main site page, with readers clicking on the title to expand the panel that contains the post text.)

My question concerned SEO. How can I optimize the JavaScripts in those AJAXed panels to ensure maximum SEO? Also, since those JavaScripts would run in the body of a theme page, would that automatically penalize me in search engines?

Thanks in advance for your advice. It’s a great help.