Así funcionaría en cualquier navegador:
Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento sin título</title>
<script type="text/javascript">
onscroll=function(){
var yScroll=self.pageYOffset || (document.documentElement.scrollTop+document.body.scrollTop);
document.getElementById('pp').innerHTML=yScroll;
}
</script>
</head>
<body>
<div id="pp" style="position:fixed;">0</div>
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.
</body>
</html>