jquery form validation

Hi,
I am tryiing to add jquery form validation (new feature in eCart 6) to a form I created using eCart 5.

Currently, there is no validation on the page, so far as i can tell.
i select the form on the page and follow menus:
Webassist>Forms>JQuery validation

The dialog box pops up, allowing me to select which form to apply validation to, etc.

I have choice of two forms. I select the second form.
However, when I try to select the fields to validate, the dropdown for selecting the fields to validate only contains one field. All the other text fields on the page are not in the dropdown.

I have included the code for my page below.

I wondered if you could help me work out why this is happening.

Thanks,

Ben

<code deled>
See attachment for full page code.