// 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);
	}
}