stop_point = 0;     
sc_int = 0;

function move_top(){
doc_sctop = document.body.scrollTop;

if(doc_sctop <= stop_point) return;
  if(doc_sctop > (250 + stop_point))
     sc_int=50;
  else
     sc_int = (doc_sctop - stop_point) / 5;
doc_sctop -= sc_int;
  if(sc_int < 1)
     doc_sctop=stop_point;
scroll(0, doc_sctop);

if(doc_sctop > stop_point)
   setTimeout("move_top()", 3);
}

var nv, yoko, tate, st, sl;

function init() {
  nv = "x";
  if ( document.layers ) nv = "n4";
  if ( document.all    ) nv = "e4";
  if ( navigator.appName=="Netscape" &&
       parseInt(navigator.appVersion) >= 5 ) nv = "n5";
  if ( nv == "n4" ) {
    yoko = parseInt( document.layers["Move"].left );
    tate = parseInt( document.layers["Move"].top  );
  } else if( nv=="n5" || nv=="e4" ) {
    yoko = parseInt( document.getElementById('Move').style.left );
    tate = parseInt( document.getElementById('Move').style.top  );
  }
  if( nv=="n4" || nv=="n5" ) setInterval( "kotei()",10 );
}

function kotei() {
  if( nv=="n4" || nv=="n5" ) {
    st = parseInt(window.pageYOffset) + tate;
    sl = parseInt(window.pageXOffset) + yoko;
  } else if ( nv=="e4") {
    st = document.body.scrollTop  + tate;
    sl = document.body.scrollLeft + yoko;
  }
  if( nv=="n4" ) {
    document.layers["Move"].top  = st;
    document.layers["Move"].left = sl;
  } else if ( nv=="e4" || nv=="n5" ) {
    document.getElementById('Move').style.top  = st;
    document.getElementById('Move').style.left = sl;
  }
}