//JAVASCRIPT
<script type="text/javascript">
 function chPic(id){
 if (id == '0'){
logo.setAttribute('style', 'background: url(kalo.png) no-repeat top center');
 }
 }
</script>




//TABS
<div id="toptabs">
<p>Change Picture:
<a class="toptab" href="#" onclick="chPic(0)">Bodega Bay</a>
<a class="toptab" href="#" >My Garden</a>
<a class="toptab" href="#">Painting</a>
<a class="toptab" href="#">My House</a></p>
</div>




//CSS
#logo{
	position:relative;
	width:900px;
	height:300px;
	float:left;
	background: url(kalobg.gif) no-repeat center;
}