// JavaScript Document

// _mac : true = macintosh, false = other os
_mac   = navigator.userAgent.toLowerCase().indexOf('mac')!=-1;
// _ie512 : true = MSIE 5.12(mac), false = others
_ie512 = navigator.userAgent.toLowerCase().indexOf('msie 5.12')!=-1;
// _kon : true = konqueror, false = others
_kon    = navigator.userAgent.toLowerCase().indexOf('konqueror')!=-1;
// _safari : true = safari, false = others
_safari = navigator.userAgent.toLowerCase().indexOf('safari')!=-1;
// _dom : kind of DOM.
//        IE4 = 1, IE5+ = 2, NN4 = 3, NN6+ = 4, others = 0
_dom = document.all?(document.getElementById?2:1):
                    (document.getElementById?4:
                    (document.layers?3:0));
function getWinYOffset(){
  if(_dom==4){
    return window.scrollY;
  }
  if(_dom==2 || _dom==1){
    if(navigator.appName == "Microsoft Internet Explorer" && document.compatMode == "CSS1Compat") {
       return document.body.parentNode.scrollTop;
    } else {
       return document.body.scrollTop;
    }
  }
  if(_dom==3){
    return window.pageYOffset;
  }
  return 0;
}
function getDivTop(div){
  if(_dom==4 || _dom==2){
    return div.offsetTop;
  }
  if(_dom==1){
    return div.style.pixelTop;
  }
  if(_dom==3){
    return div.top;
  }
  return 0;
}

var move2pos = 0;
var go2pos = 0;

function scrollerDown(pos) {
  var IE  = navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1;
  if( IE ){
    obj1 = document.all('__pos_offset');
    obj2 = document.all(pos);
    if(obj1 != null){
      position = getDivTop(obj2) + getDivTop(obj1);
    }else{
      position = getDivTop(obj2);
    }
  } else {
    obj = document.getElementById(pos);
    position = getDivTop(obj);
  }
  movePositionDown(pos);
}
function movePositionDown(pos) {
  if(go2pos == 0){
    move2pos = position;
  }
  move2pos = Math.floor(move2pos * 0.8);
  go2pos = position - move2pos;
  if( go2pos < position ){
    window.scrollTo(0,go2pos);
    setTimeout("scrollerDown('"+pos+"')",30);
  } else {
    window.scrollTo(0,position);
    //変数初期化
    move2pos = 0;
    go2pos = 0;
  }
}
function scrollerUp() {
  position = getWinYOffset();
  movePositionUp();
}
function movePositionUp() {
  position = Math.floor(position*0.8);
  if( position > 0.1 ){
    window.scrollTo(0,position)
    setTimeout("scrollerUp()",12);
  } else {
    window.scrollTo(0,0);
  }
}