// JavaScript Document

// スクロール用変数初期化
var pageScrollTimer;
var speed = 5;


//スクロール関数
function pageScroll(toX,toY,frms,cuX,cuY) {
 if (pageScrollTimer) clearTimeout(pageScrollTimer);
 if (!toX || toX < 0) toX = 0;
 if (!toY || toY < 0) toY = 0;
 if (!cuX) cuX = 0 + getScrollLeft();
 if (!cuY) cuY = 0 + getScrollTop();
 if (!frms) frms = 6;

 if (toY > cuY && toY > (getAnchorPosObj('end','enddiv').y) - getInnerSize().height) toY = (getAnchorPosObj('end','enddiv').y - getInnerSize().height) + 1;
 cuX += (toX - getScrollLeft()) / frms; if (cuX < 0) cuX = 0;
 cuY += (toY - getScrollTop()) / frms;  if (cuY < 0) cuY = 0;
 var posX = Math.floor(cuX);
 var posY = Math.floor(cuY);
 window.scrollTo(posX, posY);

 if (posX != toX || posY != toY) {
  pageScrollTimer = setTimeout("pageScroll("+toX+","+toY+","+frms+","+cuX+","+cuY+")",speed);
 }
}


<!--▼ページトップ関数-->
function jumpToPageTop() {
  pageScroll(0,0,10);
}


function getInnerSize() {
 var obj = new Object();

 if (document.all || (document.getElementById && IE)) {
  obj.width = document.body.clientWidth;
  obj.height = document.body.clientHeight;
 } else if (document.layers || (document.getElementById && Moz)) {
  obj.width = window.innerWidth;
  obj.height = window.innerHeight;
 }

 return obj;
}

function getAnchorPosObj(elementname, elementid) {
 var obj = setObj(elementname);
 var objnew = new Object();
 var objtmp;

 if (document.getElementById && IE) {
  objtmp = obj;
  objnew.x = objtmp.offsetLeft;
  objnew.y = objtmp.offsetTop;
  while ((objtmp = objtmp.offsetParent) != null) {
   objnew.x += objtmp.offsetLeft;
   objnew.y += objtmp.offsetTop;
  }
 } else if (document.getElementById && Moz) {
  objnew.x = document.getElementsByTagName("DIV").namedItem(elementid).offsetLeft;
  objnew.y = document.getElementsByTagName("DIV").namedItem(elementid).offsetTop;
 } else if (document.all) {
  objtmp = obj;
  objnew.x = objtmp.offsetLeft;
  objnew.y = objtmp.offsetTop;
  while ((objtmp = objtmp.offsetParent) != null) {
   objnew.x += objtmp.offsetLeft;
   objnew.y += objtmp.offsetTop;
  }
 } else if (document.layers) {
  objnew.x = document.anchors[elementname].x;
  objnew.y = document.anchors[elementname].y;
 } else {
  objnew.x = 0;
  objnew.y = 0;
 }
 return objnew;
}

function jumpToAnchor(elementname, elementid) {
 if (getAnchorPosObj(elementname, elementid).x != 0 || getAnchorPosObj(elementname, elementid).y != 0) {
  pageScroll(0,getAnchorPosObj(elementname, elementid).y,5);
 } else {
  location.hash = elementname;
 }
}
function getScrollLeft() {
 if ((navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1)) {
  return document.body.scrollLeft;
 } else if (window.pageXOffset) {
  return window.pageXOffset;
 } else {
  return 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;
 }
}

function getScrollWidth() {
 if ((navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1)) {
  return document.body.scrollWidth;
 } else if (window.innerWidth) {
  return window.innerWidth;
 }
 return 0;
}

function getScrollHeight() {
 if ((navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1)) {
  return document.body.scrollHeight;
 } else if (window.innerHeight) {
  return window.innerHeight;
 }
 return 0;
}