Hi, I had a similar problem where a form had a js "onClick" submit button and I needed pressing enter submit as well. The only work around that worked was that I put a submit input in the form that I hid by using div at absolute negative pixels. I don't know anything about Ajax, but it might work. Keep in mind that negative div might trigger a hidden text red flag with SEs. The page I did this on still has PR and is cached By SEs.