and in the value you enter the name of the city (or place) that you wish to point out with a marker.
You can download the script and insert into your theme sidebar.php file, and make the necessary changes to fit your needs.
You will need to add latitude and longitude coordinates for the map centre, as well as the API key that you can get from Google.
You probably also will have to edit the DOM/div tags to fit your particular theme.
You can also change other parameters to you liking.