js 实现banner轮播

<!--Banner Start-->
<div id="Banner">
  <ul id="fcimg">
  	<{section name=ad_k loop=$adData }>
	    <a <{if $adData[ad_k].url  }> href="<{$adData[ad_k].url}>" target="_blank"<{/if}> >
	    <!-- <li class="list-item" style="background: url(<{$smarty.const.UPYUN_WWW_PATH}><{$adData[ad_k].image}>) no-repeat center top;"></li> -->
	    <li class="" style="background: url(<{$smarty.const.UPYUN_WWW_PATH}><{$adData[ad_k].image}>) no-repeat center top;"></li>
	    </a>
    <{/section}>
  </ul>
  <script type="text/javascript" src="js/duice.js"></script> 
</div>

js：

var indx = 1;
var looper = 6000;
var myTimer;
$(document).ready(function(){
if($('#thscrll') && $('#thscrll img').length > 0) {
 $('#thscrll').css({"padding-bottom":"15px"}); }


  if($("#fcimg li").length >1){
  $("#fcimg").after( $('<div></div><ul id="fcnum"></ul>')); 
    for(i=1;i<=$("#fcimg li").length;i++){
if(i==1) $("#fcnum").append($("<li class=\"crn\"> </li>")); 
else $("#fcnum").append($("<li> </li>")); 
}
    myTimer = setInterval('showFImg("#fcimg li","#fcnum li","crn")', looper);
$("#fcnum li").click(function(){
indx  =  $("#fcnum li").index(this);
showFImg("#fcimg li","#fcnum li","crn");
try{
clearInterval(myTimer);
myTimer = setInterval('showFImg("#fcimg li","#fcnum li","crn")', looper);
}catch(e){}
return false;
}); 
$("#fcimg").hover(function(){
if(myTimer){ clearInterval(myTimer); }
},function(){
myTimer = setInterval('showFImg("#fcimg li","#fcnum li","crn")', looper);
});
  }
});


function showFImg(il,nl,cs){
  if($(il).length >1){
crobj = $(il).eq(indx);
$(il).not(crobj).hide();
$(nl).removeClass(cs)
$(nl).eq(indx).addClass(cs);
crobj.stop(true,true).fadeIn('slow');
indx = (++indx) % ($(il).length);
  }
}