Simply add a google map to the contact page

Hi !

I'm actually looking for a very simple google map plugin and I don't know if yours can do what I want or if you could advise me another one.

I have a page wich is called "Contact". I would like to have a field or something on the administration of this page (or a specific option page with just one field) where the user could just enter his address. Than, I would like to display a google map with this adress on the "Contact" page (as a widget or not).

In a concern of clearness, I don't want to have google maps button on each page, just on the "Contact" page.