В <div style="position: relative; left: 0; top: 0;"> ширину добавь (width).
К примеру:
<div style="position: relative; left: 0; top: 0; width: 200px;">
<img src="..." style="width: 100%; position: relative; top: 0; left: 0;">
<a href="...">
<img src="..." style="position: absolute; cursor: pointer; top: 0px; right: 0px;">
</a>
</div>
Либо лепи его слева.
<div style="position: relative; left: 0; top: 0;">
<img src="..." height="100" style="position: relative; top: 0; left: 0;">
<a href="...">
<img src="..." style="position: absolute; cursor: pointer; top: 0px; left: 0px;">
</a>
</div>