// JavaScript Document

function change_navi(){
	itemUrl = document.navi_form.select_menu.value+".html";
	location = itemUrl;
}

function getPage(pageURL) {
	xmlhttp = createXMLHttp();
	if (xmlhttp)
	{
		xmlhttp.onreadystatechange = setPageData;
		xmlhttp.open('GET', pageURL);
		xmlhttp.send(null);
	}else{
		alert("XMLHttpRequest failed");
	}
}
function setPageData()
{
	if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
	{
		document.getElementById("disp").innerHTML = xmlhttp.responseText;
		getPos();
	}
}
function createXMLHttp()
{
	try {
		return new ActiveXObject ("Microsoft.XMLHTTP");
	}catch(e){
		try {
			return new XMLHttpRequest();
		}catch(e) {
			return null;
		}
	}
	return null;
}
function getPos(){ 
	posy = cont.offsetTop+disp.offsetTop;
	var winh = document.body.clientHeight;
	var pageh = posy+disp.offsetHeight+50;
	var resth = pageh-posy;
	if(resth<=winh){
	posy = pageh-winh-10;
	}
	pageScroll(posy,0,0);
}
function getScrollTop() {
	if ((navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1)) {
		return document.body.scrollTop;
	} else if (window.pageYOffset) {
		return window.pageYOffset;
	} else {
		return 0;
	}
}
var pageScrollTimer;
function pageScroll(toY,frms,cuY) {
	if (pageScrollTimer) clearTimeout(pageScrollTimer);
	if (!toY || toY < 0) toY = 0;
	if (!cuY) cuY = 0 + getScrollTop();
	if (!frms) frms = 5;
	cuY += (toY - getScrollTop()) / frms;  if (cuY < 0) cuY = 0;
	var posY = Math.floor(cuY);
	window.scrollTo(0, posY);
	
	if (posY != toY) {
		pageScrollTimer = setTimeout("pageScroll("+toY+","+frms+","+cuY+")",16);
	}
	var pre_posY = posY;
}