jquery 圆形旋转图片滚动切换效果

<div id="rotatescroll">
<div class="viewport">
<ul class="overview">
<li><img src="images/SF1.jpg" alt="Chun-Li" /></li>
<li><img src="images/SF2.jpg" alt="VEGA" /></li>
<li><img src="images/SF3.jpg" alt="DHAISIM" /></li>
<li><img src="images/SF4.jpg" alt="KEN" /></li>
<li><img src="images/SF5.jpg" alt="BALROG" /></li>
<li><img src="images/SF6.jpg" alt="CAMMY" /></li>
<li><img src="images/SF7.jpg" alt="GOUKI" /></li>
<li><img src="images/SF8.jpg" alt="BLANKA" /></li>
<li><img src="images/SF9.jpg" alt="HONDA" /></li>
<li><img src="images/SF10.jpg" alt="FEI LONG" /></li>
<li><img src="images/SF11.jpg" alt="GUILE" /></li>
<li><img src="images/SF12.jpg" alt="RYU" /></li>
<li><img src="images/SF13.jpg" alt="SAGAT" /></li>
<li><img src="images/SF14.jpg" alt="THWAK" /></li>
<li><img src="images/SF15.jpg" alt="ZANGIEF" /></li>
</ul>
</div>

<div class="overlay"></div>
<div class="thumb"></div>
</div>

#rotatescroll {
width: 300px;
height: 300px;
margin: 0 auto;
position: relative;
}
#rotatescroll .viewport{
width: 300px;
height: 300px;
position: relative;
margin: 0 auto;
overflow: hidden;
}
#rotatescroll .overview {
width: 798px;
position: absolute;
list-style: none;
margin: 0;
padding: 0;
left: 0;
top: 0;
}
#rotatescroll .overview li {
width: 300px;
height: 300px;
float: left;
position: relative;
}
#rotatescroll .overlay {
height: 300px;
width: 300px;
background: url(../images/bg-rotatescroll.png) no-repeat 0 0;
position: absolute;
left: 0;
top: 0;
}
#rotatescroll .thumb {
width: 26px;
height: 26px;
z-index: 200;
background: url(../images/bg-thumb.png) no-repeat 50% 50%;
position: absolute;
top: 0px;
cursor: pointer;
left: 0px;
}
#rotatescroll .dot {
background: url(../images/bg-dot2.png) no-repeat 0 0;
display: none;
height: 12px;
width: 12px;
position: absolute;
left: 155px;
top: 3px;
z-index: 100;
}
#rotatescroll .dot span { display: none; }

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