为何页面两端的图片不随着页面的滚动页移动？

Question

前面的包含文件:123.js
var rightbar;
var coupletcode;
rightbar = window.screen.width-125;coupletcode = "<DIV id=sidebar style='LEFT: 5px; POSITION: absolute; TOP: 200px; VISIBILITY: hidden;' width=117>20</div><DIV id=sidebar2 style='LEFT: " + rightbar + "px; POSITION: absolute; TOP: 200px; VISIBILITY: hidden' width=117>32</div>";if (window.screen.width>=1024)
{
document.write(coupletcode);
}function InsertCouplet()
{
if (window.screen.width>=1024){
document.all.sidebar.style.visibility = "visible";
document.all.sidebar2.style.visibility = "visible";
document.all.sidebar.innerHTML = "<a href=""><img src=左边显示的图片.gif border=0></a>";
document.all.sidebar2.innerHTML = "<a href=""><img src=右边显示的图片.gif border=0></a> ";
}
} InsertCouplet();
function leftFFG_DoFSCommand(command,args){
if ((command == "SohuCLFS")&&(args =="hidecouplet")){
document.all.sidebar.style.visibility = "hidden";
document.all.sidebar2.style.visibility = "hidden";
}
}
function youFFG_DoFSCommand(command,args){
leftFFG_DoFSCommand(command,args);
} if (document.all){
document.write("<Scr"+"ipt language=\"JavaScript\" For=\"youFF\" Event=\"FSCommand(command,args)\">\n");
document.write(" leftFFG_DoFSCommand(command,args);\n");
document.write("</Scr"+"ipt>");
document.write("<Scr"+"ipt language=\"JavaScript\" For=\"leftFF\" Event=\"FSCommand(command,args)\">\n");
document.write(" leftFFG_DoFSCommand(command,args);\n");
document.write("</Scr"+"ipt>");
}