Probá así:
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=iso-8859-1" />
<title>TEST</title>
<script>
document.onkeydown=function(e){
e=e || window.event;
t=e.keyCode || e.charCode;
if(t>36 && t<41)return false;
}
window.onscroll=function(){
scrollTo(0,0);
}
</script>
</head>
<body>
hola
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chau
</body>
</html>