<div class="my-class">
   <h1>Hello</h1>
</div>

<div class="my-class">
   <img src="smiley.gif" alt="Smiley face" height="42" width="42">
   <h1>Hello</h1>
</div>

$('div.my-class').after('<img src="smiley.gif" alt="Smiley face" height="42" width="42">');