Adsense Block between the 1st and the 2nd Post in Index

Hello guys

I have tried several ways to make this but I failed.

For instance, I made this:

Step1:in index.php :
http://screencast.com/t/j1q1J97YGwOu

Step2:
And In content.php I added this:

But I failed.

How would you do it?

I use Tatami Theme.

Regards