By default, no, they’re not. Those ads are helping to pay for BlogJob itself. However, if you go to your blog’s dashboard, there should be an option on the side that says ‘Advertising’, under ‘Settings’. Click on it and you will be taken to a page with two input fields. These are where you can put your custom ad settings – be it your own Google AdSense account, Chitika ads, or any other advertisement partnership. When you click ‘save changes’, then your own ads will be shown 75% of the time, and the other 25% will continue to be used to support BlogJob. You will get residual money when people click the ads on your blog, after that.
By the way, you can find a tutorial on how to get set up with your own Google AdSense account on Sheridan’s blog.