I'm all for https everywhere...but really, what's the issue here? There's no data being transmitted over the wire on the OP's site. No sensitive data anywhere. There's little gained by putting this site under a SSL cert.
I didn't realize it was 100% client side. If so it's not an issue then, apologies.
I think there are times for not having secure stuff. Like when page loading times are slow and having an additional security layer would slow things down more.