Email Confirmation in Jumpseller Checkout

Step 1 - Create the Custom Checkout Field Called "Email Confirmation" (Or Similar in your store Language)
Step 2 - Paste this script on your Checkout Block

<script>
var email_confirmation_name = "Email Confirmation" // Replace Email Confirmation with the name of your field
var email_confirmation_id = email_confirmation_name.toLowerCase().replace(" ","_")

$("#checkout").submit(function(evt){
  if($("#order_customer_email").val() != $("#order_contact_"+email_confirmation_name).val(){
    evt.preventDefault();
   }
});

</script>