Google map - Need help on direction images

Hi,

I am working on a google map project, Needed some help.

Here is the url.
http://maps.google.com/

Enter Some location in the text area A and B say (Pune mumbai)

Then the map is displayed with the path highlighted in blue color. and directions also comes below the text fields. Notice, there are no images which say left, right etc. It is like -
1. Head toward laxmi Road 140m

Now click on the print link on the top right corner.
Now another window appears which shows you the same table but notice there are images also to the left which helps in getting the directions.

I cannot find, what is happening in the javascript side that is bringing out the images in the new window. I want to learn how these images are coming.

Thanks.