js: 文字定时切换

下面的代码实现文字（图片同理）的切换显示：

<!--  gavin_sw.html  -->
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<!--  saved from url=(0020)http://riji.163.com/  -->
< HTML >
< HEAD >
< TITLE >gavin_sw </ TITLE >
< META  http-equiv =Content-Type  content ="text/html; charset=gbk" >
</ HEAD >

< BODY  bgcolor ="#000000" >
< TABLE  cellSpacing =0  cellPadding =0  align =center  border =0 >
         < TR >
           < TD  vAlign =top  bgColor =#fdfdf8 >
             < SCRIPT  src ="notice.js" ></ SCRIPT >
             < DIV  id =imgInit  onmouseover =stopTimer(); 
                         style ="FILTER: revealTrans(duration=2, transition=3);  WIDTH: 154px; POSITION: absolute; HEIGHT: 160px; background-color:#FFFFFF"  
                        onmouseout =startTimer() ></ DIV >
             < SCRIPT  language =JavaScript > ... ...
                var imgTitle=new Array();
                imgTitle[1]="<br>aaaaaaaaaaaa__11<br><br>aaaaaaaaaaaa__22<br><br>aaaaaaaaaaaa__33<br>";
                imgTitle[2]="<br>bbbbbbbbbbbb__11<br><br>bbbbbbbbbbbb__22<br><br>bbbbbbbbbbbb__33<br>";
                imgTitle[3]="<br>cccccccccccc__11<br><br>cccccccccccc__22<br><br>cccccccccccc__33<br>";
                imgTitle[4]="<br>dddddddddddd__11<br><br>dddddddddddd__22<br><br>dddddddddddd__33<br>";
                nextAd(imgTitle.length);
             </ SCRIPT >
           </ TD >
         </ TR >
</ TABLE >
</ BODY >
</ HTML >

//------------------    notice.js   ------------------

var  adNum = 0 ;
var  timerID  =   4000 ;
function  playTran() ... {
    imgInit.filters.revealTrans.play();
}

function  nextAd() ... {        
    if(adNum >= j)...{
        adNum=1;
    }
    if(adNum != 0)...{
        imgInit.filters.revealTrans.Transition=20;
        imgInit.filters.revealTrans.apply();
        imgInit.innerHTML=imgTitle[adNum];
        playTran();
    }
    adNum++;

    theTimer=setTimeout("nextAd()", timerID);
}
        
function  stopTimer()  ... {
   window.clearTimeout(theTimer);
}
            
function  startTimer()  ... {
   theTimer=setTimeout("nextAd()", timerID);
}