Pre-select a field from the Contact form

Hello i need some help,



How can i pre-select a field from the Contact form?

ex: a item from a combo-box



Something link this, but for combo-boxs:

[url]http://www.simplecontactform.com/forums/topic/pre-fill-contact-form-fields-using-querystring-pro[/url]



Any ideias to make this in CS-Cart v2.14?