var SwapID=0;
var PauseTime=15*1000;
var Timer1;
function swap(Obj)
{var st = document.getElementsByName('lt2');
var j;
if(st.length>0)
{for(j=0; j<st.length; j++)
{if(st[j]==Obj)
{lt2[j].style.display='';
//mt[j].style.background='url(images/lb1.gif)';#C8D5DD;
//mt[j].style.background='#F2F7FD';
mt[j].style.background='#ADC1DA'
mt[j].style.color='#FFFFFF'}
else
{lt2[j].style.display='none';
mt[j].style.background='#FFFFFF';
mt[j].style.color='#333333'}}}}
function AutoSwap()
{//StopSwap();Swap(lt[SwapID])
for (i=0;i<2;i++)
Swap(lt[i]);
//SwapID+=1;
//if (SwapID==3) { SwapID=1; }
Timer1=setTimeout("AutoSwap()",PauseTime);}
function StopSwap()
{clearTimeout(Timer1);}
var PauseTime=15*1000;
var Timer1;
function swap(Obj)
{var st = document.getElementsByName('lt2');
var j;
if(st.length>0)
{for(j=0; j<st.length; j++)
{if(st[j]==Obj)
{lt2[j].style.display='';
//mt[j].style.background='url(images/lb1.gif)';#C8D5DD;
//mt[j].style.background='#F2F7FD';
mt[j].style.background='#ADC1DA'
mt[j].style.color='#FFFFFF'}
else
{lt2[j].style.display='none';
mt[j].style.background='#FFFFFF';
mt[j].style.color='#333333'}}}}
function AutoSwap()
{//StopSwap();Swap(lt[SwapID])
for (i=0;i<2;i++)
Swap(lt[i]);
//SwapID+=1;
//if (SwapID==3) { SwapID=1; }
Timer1=setTimeout("AutoSwap()",PauseTime);}
function StopSwap()
{clearTimeout(Timer1);}
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<SCRIPT>
var SwapID=0;
var PauseTime=15*1000;
var Timer1;
function swap(Obj)
{var st = document.getElementsByName('lt2');
var j;
if(st.length>0)
{for(j=0; j<st.length; j++)
{if(st[j]==Obj)
{lt2[j].style.display='';
//mt[j].style.background='url(images/lb1.gif)';#C8D5DD;
//mt[j].style.background='#F2F7FD';
mt[j].style.background='#ADC1DA'
mt[j].style.color='#FFFFFF'}
else
{lt2[j].style.display='none';
mt[j].style.background='#FFFFFF';
mt[j].style.color='#333333'}}}}
function AutoSwap()
{//StopSwap();Swap(lt[SwapID])
for (i=0;i<2;i++)
Swap(lt[i]);
//SwapID+=1;
//if (SwapID==3) { SwapID=1; }
Timer1=setTimeout("AutoSwap()",PauseTime);}
function StopSwap()
{clearTimeout(Timer1);}
</SCRIPT>
</head>
<BODY>
<DIV id=all>
<DIV id=ppyule></DIV>
<!--子菜单-->
<!--正文开始,相关内容-->
<DIV id=ppyule>
<DIV id=left_top>
<DIV id=caidans>
<DIV style="BORDER-RIGHT: 0px; BORDER-TOP: 0px; BORDER-LEFT: 0px; BORDER-BOTTOM: 0px">
<SPAN id=mt onmouseover=swap(lt2[0]); style="BACKGROUND: #adc1da; COLOR: #ffffff">2完成计划</SPAN>
<SPAN id=mt onmouseover=swap(lt2[1]);>待完成计划</SPAN>
<DIV id=lt2><ul><li>已完成计划</li><li>已完成计划</li><li>已完成计划</li></ul></DIV>
<DIV id=lt2 style="DISPLAY: none"><ul><li>待完成计划</li><li>待完成计划</li><li>待完成计划</li></ul></DIV>
</DIV>
</DIV>
</DIV>
</DIV>
</DIV>
</BODY></HTML>
2、js中document.getElementsByName('lt2'),HTML中id=lt2
3、逻辑很乱