how to copy "phone " to checked accounts?

[Amy Sung]

We use Windows Vista
SugarCRM Version 5.2.0j (Build 5804)
Websever: IIS
PHP 5.2.11
MySQL 5.1

In custom sugar Account's module,there is a "Accounts copy address to contact" button.
I need a similar button,but it has to copy the Account's phone no. to the Contact's phone no.,how can I do this?

Can somebody give me the solution, or the code I need for the query?
Thanks