On the checkout page of a Ecommerse site, I have 2 large buttons, one if the customer is a new user, the other if the customer is returning and already has an account.

When a button is clicked, the buttons disapear, and the fields slide out below. The problem is that if the user does not fill out all the required fields and is redirected back to the page, the 2 main buttons are there again. After clicking the button though, I do see the form with the notices that say I need to fill out all required fields.

I have tried getting the post, checking if submit was pressed, but I submit is not being passed with the post. I also tried checking if any of the forums were set (Like Country, which is a dropdown and would always be set), but no luck there.

Is there a way to just check if a form has failed validation, so I can automatically show the menu?