CSS:

<style type="text/css"> #show{position:relative;margin:20px auto;width:800px;} .item{position:absolute;height:40px;width:60px;background:#999999;border:1px solid #eeeeee;cursor:pointer;}</style> 


Html:

input id="l" type="button" value="left" /> <input id="r" type="button" value="right" /> <div id="show"> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> <div class="item">4</div> <div class="item">5</div> <div class="item">6</div> <div class="item">7</div> <div class="item">8</div> <div class="item">9</div> <div class="item">0</div> <div class="item">a</div> <div class="item">b</div> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> </div> 


JS

<script> var len; var showerObj; var listObj; var showerWidth=800; var showerHeight=400; var r; var cR=0; var ccR=0; var timer=0; window.  showerObj=document.getElementById("show");  listObj=showerObj.getElementsByTagName("div");  len=listObj.length;  r=Math.PI/180*360/len;  for(var i=0;i<len;i++){  var item=listObj[i];  item.style.top=showerHeight/2+Math.sin(r*i)*showerWidth/2-20+"px";  item.style.left=showerWidth/2+Math.cos(r*i)*showerWidth/2-30+"px";  item.rotate=(r*i+2*Math.PI)%(2*Math.PI);  item.   cR=Math.PI/2-this.rotate;   timer || (timer=setInterval(rotate,10));      }     }  var rX=showerObj.offsetLeft+showerWidth/2;  var ry=showerObj.offsetTop+showerHeight/2;     var rotate=function(){  ccR=(ccR+2*Math.PI)%(2*Math.PI);  if(cR-ccR<0) cR=cR+2*Math.PI;  if(cR-ccR<Math.PI){   ccR=ccR+(cR-ccR)/19;  }else{   ccR=ccR-(2*Math.PI+ccR-cR)/19;     }     if(Math.abs((cR+2*Math.PI)%(2*Math.PI)-(ccR+2*Math.PI)%(2*Math.PI))<Math.PI/720){   ccR=cR;   clearInterval(timer);   timer=0;  }     for(var i=0;i<len;i++){   var item=listObj[i];   var w,h;   var sinR=Math.sin(r*i+ccR);   var cosR=Math.cos(r*i+ccR);   w=60+0.6*60*sinR;   h=(40+0.6*40*sinR);   item.style.cssText +=";width:"+w+"px;height:"+h+"px;top:"+parseInt(showerHeight/2+sinR*showerWidth/2/3-w/2)+"px;left:"+parseInt(showerWidth/2+cosR*showerWidth/2-h/2)+"px;z-index:"+parseInt(showerHeight/2+sinR*showerWidth/2/3-w/2)+";";     }  }     document.getElementById("l").  cR=(cR+r+2*Math.PI)%(2*Math.PI);  timer || (timer=setInterval(rotate,10));  }  document.getElementById("r").  cR=(cR-r+2*Math.PI)%(2*Math.PI);  timer || (timer=setInterval(rotate,10));  }  rotate(); } </script> 

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