New Captivate: Any way to automatically execute JavaScript?

I need to automatically call a JavaScript function when a Captivate course first loads. IIRC this was somewhat possible in Classic Captivate, but I haven’t been able to find a way to do it in New Captivate. I know I could manually edit a call into the generated HTML, but I’d prefer a solution that didn’t require manual intervention after every publish.

Thanks.