Here's the CSS code you need to implement:

#container {
height: 200px;
width: 980px;
margin-right: auto;
margin-left: auto;
margin-top: 80px;
left: 80px;
}
#top {
width: 980px;
margin-right: auto;
margin-left: auto;
}
#left {
float: left;
height: 152px;
width: 80px;
padding-right: 0px;
position: absolute;
left: 90px;
}

#container #content {
float: left;
height: 90px;
width: 218px;
padding-right: 10px;
overflow: hidden;
z-index: 0;
position: absolute;
left: 170px;
border: 1px solid #999999;
background: url(bg.jpg) repeat-x bottom;
}
#container #content #innercontent {
height: 90px;
overflow: hidden;
position: absolute;
width: 990px;
z-index: -1;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
#container #content #innercontent img {
padding: 10px;
}
#right {
float: left;
height: 144px;
width: 80px;
z-index: 100;
background: #FFFFFF;
position: absolute;
left: 400px;
}

And here's the script itself:

<script language="javascript">

window.addEvent('domready',function(){

$('leftmov').addEvent('click',function(){
leftx = document.getElementById('innercontent');
x = leftx.style.left.toInt();
if(x == "" || isNaN(x)){
x = 0;
}

$('innercontent').effect('left',{ duration: 800, transition: Fx.Transitions.Bounce.easeOut, wait:true }).start(x, x + 111 );

})

$('rightmov').addEvent('click',function(){
rightx = document.getElementById('innercontent');
x = rightx.style.left.toInt();
if(x == "" || isNaN(x)){
x = 0;
}
$('innercontent').effect('left',{ duration: 800, transition: Fx.Transitions.Quad.easeIn, wait:true }).start(x, x - 111 )

})
})

</script>