อ่อ ขอตอบ javascript ธรรมดานี่ก็ทำได้ครับ
ขอดิบๆเลย
<script language="JavaScript">
<!--
function onchangeimage(img){
document.getElementById('showimage').src = img;
}
//-->
</script>
<a href='javascript:void(0)' onclick="onchangeimage('
http://www.httpartist.com/beta...on2008/deviant-icon36.jpg' 
)">รูป1</a><br>
<a href='javascript:void(0)' onclick="onchangeimage('
http://www.blogipalm.com/wp-co...1/green-bangkok-wi-fi.jpg' 
)">รูป2</a><br>
<a href='javascript:void(0)' onclick="onchangeimage('
http://www.sadung.com/images/d...nload_icon/icon_green.jpg' 
)">รูป3</a>
<br><br>
<img src='
http://www.interiorsiam.com/wp...ys-to-green-your-home.jpg' 
id='showimage'>