Forms and components

Hi there, I need help with this, I’m creating a contact form with input text fields, then in a button, I’m using this:

on (release) {
gotoAndPlay(“gracias”);
this.loadVariables(“contacts.php”, “POST”);
}

it’s working great, the only problem, is, I’ve a dropdown component, and I don’t know how to send the variable to the PHP document, what I’ve populated in the combo box is:

General Enquiry
Record Label Enquiry
Radio Show Enquiry
Publishing Enquiry
Management & Licensing Enquiry
Recording Studio Enquiry

can somebody here help me please?

Thanks in advance!

Arturo