HTML图片轮播代码

<div style="position:relative; top:-50px; left:240px;">
    <a href="javascript:show(1)"><span id="I1" style="width:18px; text-align:left; background:gray">1</span></a>
    <a href="javascript:show(2)"><span id="I2" style="width:18px;text-align:left;2</span></a>
  <a href="javascript:show(3)"><span id="I3" style="width:18px;text-align:left;3</span></a>
    <a href="javascript:show(4)"><span id="I4" style="width:18px;text-align:left;4</span></a>
    <a href="javascript:show(5)"><span id="I5" style="width:18px;text-align:left;5</span></a>
    <a href="javascript:show(6)"><span id="I6" style="width:18px;text-align:left;6</span></a></div>
    <script language="javaScript"> 
 var nowIndex=1;
 var maxIndex=6;
 function show(index)
 {
 if(Number(index)){                                     
 clearTimeout(theTimer);
 nowIndex=index;
 }
 for(var i=1;i<(maxIndex+1);i++){
  if(i==nowIndex)
   {document.getElementById('pic'+nowIndex).style.display='';
   document.getElementById('I'+nowIndex).style.backgroundColor='red';}
  else
   {document.getElementById('pic'+i).style.display='none';
   document.getElementById('I'+i).style.backgroundColor='gray';}
  }{
  if(nowIndex==maxIndex)
   nowIndex=1;
  else
   nowIndex++;
  }
 theTimer=setTimeout('show()',3000);
 }
 </script>
 </div>
二、图片自动播放：
<div id="butong_net_left" style="overflow:hidden;width:1000px;">
<table cellpadding="0" cellspacing="0" border="0">
<tr><td id="butong_net_left1" valign="top" align="center">
<table cellpadding="2" cellspacing="0" border="0">
<tr align="center">