Updated label

HTML

<img src="images/w2wfAjOgM8kjrWEwLQEzeQ==_thumbnail.jpg" width="32px" height="32px" title="238 x 212">
<label class="imglabel">
  238 x 212
</label>
<input type="hidden" name="COVERART46">

JavaScript

var imglabel    = document.getElementsByClassName("imglabel");
imglabel[0].innerHTML = "20 x 30";