Can't write data into database

[eluser]penta997[/eluser]
as I say, I have a register form. And this is my table structure:

table users:

USR_ID
USR_Nick
USR_Pass
USR_CreateDate


table address

ADDR_ID
COUNTRY_COUNTRY_Id
STATE_State_Id
USERS_USR_ID
ADDR_CityName
ADDR_StreetName
ADDR_StreetNr
ADDR_HomeNr
ADDR_ZIP
ADDR_Fax



table client

CLI_ID
Address_ADDR_ID
CLI_Email
CLI_NAme
CLI_LastName
CLI_NIP
CLI_Regon
CLI_Phone
CLI_Pesel

and i trying to insert data from form into database. And i have a problem with ID's, so I get the value from form for example: USR_Name and getting his Id to insert it to address table, becouse there I need this value.