View the demo's source:
HTML Code:
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td width="20%"><a href="#" onMouseover="modifyimage('dynloadarea', 0)"><img border="0" src="thumb1.jpg" width="50" height="50" style="margin-bottom: 5px"></a><br>
<a href="#" onMouseover="modifyimage('dynloadarea', 1)"><img border="0" src="thumb2.jpg" width="50" height="50" style="margin-bottom: 5px"></a><br>
<a href="#" onMouseover="modifyimage('dynloadarea', 2)"><img border="0" src="thumb3.jpg" width="50" height="50" style="margin-bottom: 5px"></a></td>
<td width="80"><!--webbot bot="HTMLMarkup" startspan --><div id="dynloadarea" style="width:50px;height:225px"></div><!--webbot bot="HTMLMarkup" endspan i-checksum="17728" --></td>
</tr>
</table>
It uses a table to achieve that layout. There are other ways.
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