<style>
#scrollImg {
position:absolute;
left:expression(screen.width-this.width-24);
top:expression(document.body.scrollTop+100);
}
</style>
<body onscroll="scrollImg.style.top=document.body.scrollTop+100">
<IMG SRC="a.gif" id='scrollImg'>
<div style='height:800px'>
</body>
#scrollImg {
position:absolute;
left:expression(screen.width-this.width-24);
top:expression(document.body.scrollTop+100);
}
</style>
<body onscroll="scrollImg.style.top=document.body.scrollTop+100">
<IMG SRC="a.gif" id='scrollImg'>
<div style='height:800px'>
</body>
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