Need help with Foreign Keys

Can someone please help me to setup foreign keys between these 3 tables.

I would like to setup the FK as follow:

id_prov -->(FK)idprov_city and id_city -->(FK)idcity_suburb

The problem I'm experiencing is when I feed my database using dependent dropdown menus the value used to control the dropdowns is fed into the db not the label.

I would appreciate any help.

The tables are listed below


Province:

CREATE TABLE `db`.`province` (
`id_prov` INTEGER UNSIGNED NOT NULL DEFAULT NULL AUTO_INCREMENT,
`name_prov` VARCHAR(45) NOT NULL,
PRIMARY KEY (`id_prov`)
)
ENGINE = InnoDB;

City:

CREATE TABLE `db`.`city` (
`id_city` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
`idprov_city` INTEGER UNSIGNED NOT NULL,
`name_city` VARCHAR(65) NOT NULL,
PRIMARY KEY (`id_city`)
)
ENGINE = InnoDB;

Suburb:

CREATE TABLE `db`.`suburb` (
`id_suburb` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
`idprov_suburb` INTEGER UNSIGNED NOT NULL,
`idcity_suburb` INTEGER UNSIGNED NOT NULL,
`name_suburb` VARCHAR(255) NOT NULL,
PRIMARY KEY (`id_suburb`)
)
ENGINE = InnoDB;