在网页HTML语法中插入以下代码: 

<Script Language=Javascript> 
<!-- 
function SmileAdver_Class(){ 
var leftImageArray = new Array();   //保存左边的广告图片数组 
var rightImageArray = new Array();  //保存右边的广告图片数组 
var leftPos,rightPos;               //leftPos = 左边广告的距左边栏位置(px)    rightPos = 右边广告的距右边栏位置(px) 
var leftTop,rightTop;               //leftTop = 左边广告的距顶边栏位置(px)    rightTop = 右边广告的距顶边栏位置(px) 
var lastScrollY=0;  
  
leftPos = rightPos = 1;            //默认为10 
leftTop = rightTop = 1;           //默认为150 
this.setLeftPos = function(value){ 
  if(isNaN(value)){value = 10;}   //非数字则默认为10 
  leftPos = value; 
} 
this.setRightPos = function(value){ 
  if(isNaN(value)){value = 10;}   //非数字则默认为10 
  rightPos = value; 
} 
this.setLeftTop = function(value){ 
  if(isNaN(value)){value = 1}   //非数字则默认为150 
  leftTop = value; 
} 
this.setRightTop = function(value){ 
  if(isNaN(value)){value = 1;}   //非数字则默认为150 
  rightTop = value; 
} 
//添加左边的图片广告 addLeftImage(链接,图片地址,链接目标,图片提示) 
this.addLeftImage = function(href,image,target,title){ 
  var imageArray = getImageArray(href,image,target,title); 
  if(imageArray != null){ 
     leftImageArray[leftImageArray.length] = imageArray; 
  } 
} 
//添加右边的图片广告 addRightImage(链接,图片地址,链接目标,图片提示) 
this.addRightImage = function(href,image,target,title){ 
  var imageArray = getImageArray(href,image,target,title); 
  if(imageArray != null){ 
     rightImageArray[rightImageArray.length] = imageArray; 
  } 
} 
//内部添加广告图片使用,如果没有图片地址,则返回一个null值,否则返回一个数组 
function getImageArray(href,image,target,title){ 
  if(image == undefined){return null;}                 //没有图片地址,不添加 
  if(target == undefined || target == ""){target = "_blank"};     //默认为_blank打开方式 
  target = " target=\"" + target + "\""; 
  if(title == undefined){                         //广告图片title提示 
   title = "" ; 
  }else{ 
   title = " title=\"" + title + "\""; 
  } 
  //链接以www.开头则自动加上http://  (否则链接时会链接错误) 
  if(href.toLowerCase().substring(0,4) == "www."){ 
    href = "http://" + href; 
  } 
  if(image.toLowerCase().substring(0,4) == "www."){ 
    image = "http://" + image; 
  } 
  return new Array(href,image,target,title); 
} 
//内部显示图片横幅所用 showImageDiv(div的名称,div的摆放方向(left,right),div的摆放位置,div层距顶部的位置,显示的图片数组变量) 
function showImageDiv(div,pos,posPX,topPx,imageArray){ 
  var i; 
  document.write("<div id=\"" + div + "\" style=\"" + pos + ":" + posPX + "px;POSITION:absolute;TOP:" + topPx + "px;\">"); 
  for(i=0; i< imageArray.length; i++){ 
     document.write("<a href=\"" + imageArray[i][0] + "\" "+ imageArray[i][2]+ imageArray[i][3] + "><img src=\""+ imageArray[i][1] + "\" border=\"0\" "+ imageArray[i][3] + "></a>"); 
     if(i != imageArray.length-1){document.write("<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\"><tr><td height=10></td></tr></table>");} 
  } 
  document.write("</div>"); 
} 
//滚动广告对联图片 
this.scroll = function(){ 
  showImageDiv("smilediv1","left",leftPos,leftTop,leftImageArray); 
  showImageDiv("smilediv2","right",rightPos,rightTop,rightImageArray); 
   window.setInterval(scrollImage,1); 
} 
this.scrollImg= function(){ 
scrollImage(); 
} 
//内部使用用来滚动广告图片 
function scrollImage(){ 
  var diffY,percent; 
  diffY=document.body.scrollTop; 
//alert(diffY);  
  percent=.1*(diffY-lastScrollY);  
  if(percent>0)percent=Math.ceil(percent);  
  else percent=Math.floor(percent);  
  document.all.smilediv1.style.pixelTop+=percent;  
  document.all.smilediv2.style.pixelTop+=percent;     
  lastScrollY=lastScrollY+percent; 
//alert(document.all.smilediv1.style.pixelTop); 
//alert(document.all.smilediv2.style.pixelTop);  
} 
} 
///////////////////////////////////////////类结束//////////////////////////////////////////////////////////////// 

  

  

  


/////////类的使用示例代码//////////////////////////////////////////////// 
var SmileAdver = new SmileAdver_Class(); 
SmileAdver.setLeftPos(5); 
SmileAdver.setRightPos(5); 
SmileAdver.setLeftTop(100); 
SmileAdver.setRightTop(100); 
SmileAdver.addLeftImage("http://www.jpcode.net","http://www.jpcode.net/img/jsimg/duilian.png","",""); 
SmileAdver.addRightImage("http://www.jpcode.net","http://www.jpcode.net/img/jsimg/duilian.png","",""); 
SmileAdver.scroll(); 
--> 
</Script> 

转载自『大雪飞歌－正安一片瓦的博客』http://blog.gzza.com