//定義左聯圖片的所在位置及其連接目標的地址
var leftsrc ="images/spacer.gif" ;
var leftlink = "";
//定義右聯圖片的所在位置及其連接目標的地址
var rightsrc =  "images/back.png";
var rightlink = "";
//定義"關閉"按鈕圖片的所在位置
var closesrc ="images/spacer.gif";

lastScrollY=0;

function heartBeat(){
var diffY;
if (document.documentElement && document.documentElement.scrollTop)
 diffY = document.documentElement.scrollTop;
else if (document.body)
 diffY = document.body.scrollTop
else
 {/*Netscape stuff*/}
//alert(diffY);
percent=.1*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent);
else percent=Math.floor(percent);
document.getElementById("leftFloater").style.top=parseInt(document.getElementById
("leftFloater").style.top)+percent+"px";
document.getElementById("rightFloater").style.top=parseInt(document.getElementById("rightFloater").style.top)+percent+"px";
lastScrollY=lastScrollY+percent;
//alert(lastScrollY);
}

leftFloaterDIV="<div id=\"leftFloater\" style='left:2px;position:absolute;top:500px; cursor:pointer;'><div onclick=javascript:window.open(\"" + leftlink + "\")><img src=\"" + leftsrc +"\" /></div><div onclick=\"document.getElementById('leftFloater').style.display = 'none'; document.getElementByzId('leftFloater').style.display = 'none';\" style='text-align:center;'><img src=\"" + closesrc +"\" /></div></div>"
rightFloaterDIV="<div id=\"rightFloater\" style='right:2px;position:absolute;top:500px; cursor:pointer;'><div onclick=javascript:history.back()><img src=\"" + rightsrc +"\" /></div><div onclick=\"document.getElementById('leftFloater').style.display = 'none'; document.getElementById('rightFloater').style.display = 'none';\" style='text-align:center;'><img src=\"" + closesrc +"\" /></div></div>"

document.write(leftFloaterDIV);
document.write(rightFloaterDIV);
 
window.setInterval("heartBeat()",1);