I am doing an example app with admob for learning purpose. I refer to this website and created a project with same package name and same publisher_id as in that site. I run the app it shows the ad but different from the site. So that I created an account in admob (not real data and test mode) with my own package name. I have used my account’s publisher_id and package name. But in the both the cases I got same ad. I run the app from emulator sdk 4.0.
This is what I got:

How to display some different ads instead of the above ad? Please help me.
The emulator is defined as testdevice, means that only testAds (like the Ad you see) get displayed.