zohoWebToLead in wordpress with mandatory fields

I've created a zohoWebToLead form and added it to a page in Wordpress. The form is set to to have mandatory fields - but the mandatory fields don't work with Wordpress. However, the form does work when it is not in Wordpress. Can anyone help me get it to work within Wordpress WITH mandatory fields. You can see the form at: - http://the80percentcompany.com/wp/?page_id=37

Peter