Form Filled Input Data to More Than One Database and Table

[Rizki]

hai

i want to make the update form for my website, and in my update form there is two combo box for chose where database you want to input the data and where table do you want to fill the field, for eaxample:
_______________
chose database to save |___________|_|
_______________
chose table to save |_____________| _|

if i chose database "example1" table "field1" then it will input to database and table that i chose.

my problem is i don't know mysql query for that update form.

please help me

[code green]

UPDATE dbname.tablename SET fieldname = formvalue
WHERE .......