// nazca index.html
//
function setPosition(x, y)
{
  if (document.layers) {
    this.objstyle.moveTo(x, y);
  } else { // IE and N6
    this.objstyle.left = x + "px";
    this.objstyle.top = y + "px";
  }
  this.x = x;
  this.y = y;
}
function setPositionWithScroll(x, y)
{
  var scrlX, scrlY;
  if (document.layers) {
    scrlX = window.pageXOffset;
    scrlY = window.pageYOffset;
    this.objstyle.moveTo(scrlX + x,scrlY + y);
  } else if (document.all) {
    scrlX = document.body.scrollLeft;
    scrlY = document.body.scrollTop;
    this.objstyle.left = scrlX + x + "px";
    this.objstyle.top = scrlY + y + "px";
  } else if (document.getElementById) {
    scrlX = window.scrollX;
    scrlY = window.scrollY;
    this.objstyle.left = scrlX + x + "px";
    this.objstyle.top = scrlY + y + "px";
  }
  this.x = x;
  this.y = y;
}
function setVisible(s)
{
  if (document.layers) {
    this.objstyle.visibility = (s)? true : false
  } else if (document.all) {
    this.objstyle.visibility = (s)? "visible" : "hidden"
  } else if (document.getElementById) {
    this.objstyle.visibility = (s)? "visible" : "hidden"
  }
  this.visible = s;
}
function MovingObject(num, src, width, height)
{
  document.write('<div id="MVOBJ',num,'" class="movingobject">');
  document.write('<img src="',src,'" width="',width,'" height="',height,'">');
  document.write('<\/div>');
  if (document.layers) {
    this.objstyle = document.layers["MVOBJ"+num];
  } else if (document.all) {
    this.objstyle = document.all["MVOBJ"+num].style;
  } else if (document.getElementById) {
    this.objstyle = document.getElementById("MVOBJ"+num).style;
  }
  this.id = "MVOBJ"+num;
  this.src = src;
  this.width = width;
  this.height = height;
  this.x = -200;
  this.y = 0;
  this.visible = 1;
  this.move = setPosition;
  this.moveScrl = setPositionWithScroll;
  this.show = setVisible;
}
function getEventPos(nsEvent)
{
  var scrlX, scrlY;
  if (document.layers) {
    scrlX = window.pageXOffset;
    scrlY = window.pageYoffset;
    eventPosX = nsEvent.pageX - window.pageXOffset;
    eventPosY = nsEvent.pageY - window.pageYOffset;
    eventProc(nsEvent.type, eventPosX, eventPosY);
  } else if (document.all) {
    eventPosX = event.clientX;
    eventPosY = event.clientY;
    eventProc(event.type, eventPosX, eventPosY);
  } else if (document.getElementById) {
    eventPosX = nsEvent.clientX;
    eventPosY = nsEvent.clientY;
    eventProc(nsEvent.type, eventPosX, eventPosY);
  }
}
var docWidth, docHeight;
function getDocSize()
{
  if (document.layers) {
    docWidth = window.innerWidth;
    docHeight = window.innerHeight;
  } else if (document.all) {
    docWidth = document.body.clientWidth;
    docHeight = document.body.clientHeight;
  } else if (document.getElementById) {
    docWidth = window.innerWidth;
    docHeight = window.innerHeight;
  }
}
function readyDhtml()
{
  return((document.layers || document.all || document.getElementById)?1:0);
}
function isNetscape()
{
  return((document.layers || document.getElementById && !document.all)?1:0); 
}







/*流れ星
**********************************
    設定可能なパラメタ(ここから)
**********************************
*/
var MAXSTAR    = 6;           // 画像の数
var STARIMG    = "img/star.gif";  // 画像のファイル名
var STARWIDTH  = 10;          // 画像の幅
var STARHEIGHT = 10;          // 画像の高さ
var OFFSETX    = 0;           // マウスからの距離の補正(右方向)
var OFFSETY    = 10;          // マウスからの距離の補正(下方向)
var PITCH      = 0.7;         // 進度(0.1～0.9)大きいほど速い
var TLATE      = 100;         // 処理の間隔(msec) 分からなければこのまま
/***********************************
    設定可能なパラメタ(ここまで)
 ***********************************/
star = new Array();
starx0 = new Array();
stary0 = new Array();
starx = new Array();
stary = new Array();
targetx = new Array();
targety = new Array();

function eventProc(type, eventX, eventY)
{
  targetx[0] = eventX + OFFSETX;
  targety[0] = eventY + OFFSETY;
  starx0[0] = starx[0];
  stary0[0] = stary[0];
}
function moveShootingStar()
{
  for (i = 0; i < MAXSTAR; i++) {
    starx0[i] = starx[i];
    stary0[i] = stary[i];
    if (i > 0) {
      targetx[i] = starx0[i-1];
      targety[i] = stary0[i-1];
    }
    minusx = (starx0[i] < targetx[i])? 1: 0
    minusy = (stary0[i] < targety[i])? 1: 0
    starx[i] = targetx[i] + Math.floor((starx0[i] - targetx[i] + minusx) * (1 - PITCH));
    stary[i] = targety[i] + Math.floor((stary0[i] - targety[i] + minusy) * (1 - PITCH));
    star[i].moveScrl(starx[i], stary[i]);
  }
  setTimeout("moveShootingStar()", TLATE);
}
if (readyDhtml()) {
  for (i = 0; i < MAXSTAR; i++) {
    star[i] = new MovingObject(i, STARIMG, STARWIDTH, STARHEIGHT);
    starx[i] = star[i].x;
    stary[i] = star[i].y;
    starx0[i] = starx[i];
    stary0[i] = stary[i];
    targetx[i] = starx0[i];
    targety[i] = starx0[i];
  }
  if (isNetscape()) {
    window.document.captureEvents(Event.MOUSEMOVE);
  }
  document.onmousemove = getEventPos;
  moveShootingStar();
}