jump to top of page without a link or with a link

<script type="text/javascript"><!--
window.onload = function() {
  scrollTo(0,0);
}
// -->
</script>

or
<script language="JavaScript" type="text/javascript">
 <!--
 document.write("<a href= \"" + document.location + "#top\">Jump Up</a>");
 // -->
 </script>