什么是一端时间轮换的广告

//滚动页面的宽
var scrollwidth = 705;

//滚动页面的高
var scrollheight = 120;

if(dde_pp!=null && dde_pp.length>0){
  dde_para = dde_pp.split("&");}
  for(i=0; dde_para!=null && i   dde_aa = dde_para[i].split("=");
  eval("var "+dde_aa[0] +"='"+dde_aa[1]+"'");}
var car_num = 5;
var i=1;
//默认滚动时间10秒
var pausebetweenimages=800 * 8;
var slideimages=new Array();
//滚动页面1的URL
slideimages[0]="";
//滚动页面2的URL
slideimages[1]="";
function move1(whichdiv){
tdiv=eval(whichdiv)
if (tdiv.style.pixelTop>0&&tdiv.style.pixelTop tdiv.style.pixelTop=0
setTimeout("move1(tdiv)",pausebetweenimages)
setTimeout("move2(second2)",pausebetweenimages)
return}
if (tdiv.style.pixelTop>=tdiv.offsetHeight*-1){
tdiv.style.pixelTop-=car_num
setTimeout("move1(tdiv)",50)}
else{
tdiv.style.pixelTop=scrollheight
tdiv.innerHTML=slideimages[0]
if (i==slideimages.length-1)
i=0
else i++}}
function move2(whichdiv){
tdiv2=eval(whichdiv)
if (tdiv2.style.pixelTop>0&&tdiv2.style.pixelTop tdiv2.style.pixelTop=0
setTimeout("move2(tdiv2)",pausebetweenimages)
setTimeout("move1(first2)",pausebetweenimages)
return}
if (tdiv2.style.pixelTop>=tdiv2.offsetHeight*-1){
tdiv2.style.pixelTop-=car_num
setTimeout("move2(second2)",50)}
else{
tdiv2.style.pixelTop=scrollheight
tdiv2.innerHTML=slideimages[1]
if (i==slideimages.length-1)
i=0
else i++}}
function conmouse(){car_num=0;}
function cmouseout(){car_num=5;}
function startscroll(){
if (document.all){
move1(first2)
second2.style.top=scrollheight
}
else if (document.layers){
move1(document.main.document.first)
document.main.document.second.top=scrollheight+5
document.main.document.second.visibility='show'}}
//-->

        width="&{scrollwidth};">
        top="1" width="&{scrollwidth};" id=first>
 
 
        visibility="hide">
 
 
 
 

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