How to put google adsense block in the middle of the post

Go to your blogger account, and navigate to Layout >> edit html, and check check Expand Widget Templates

Find the tag :

<data:post.body/>

And replace it with the following code.

<div expr:id='"aim1" + data:post.id'></div>
<div style="clear:both; margin:10px 0">
<!-- Your AdSense code here -->
</div>
<div expr:id='"aim2" + data:post.id'>
<data:post.body/>
</div>
<script type="text/javascript">
var obj0=document.getElementById("aim1<data:post.id/>");
var obj1=document.getElementById("aim2<data:post.id/>");
var s=obj1.innerHTML;
var r=s.search(/x3C!-- adsense --x3E/igm);
if(r>0) {obj0.innerHTML=s.substr(0,r);obj1.innerHTML=s.substr(r+16);}
</script>

Note that you must replace

<!-- Your AdSense code -->

with block code provided by Google.

Now you are done, just to put your google adsense block in the middle of the post, you have to put this code

in the exact place you want to put AdSense block.

and now you are done.